Split DevTools customer tests into its own customer_testing_devtools shard - #195871

These overrides date from when the shards ran 30-45 minutes. After
flutter#195628, flutter#195863, and flutter#195871 their test steps take 9-20 minutes, so
the 30 minute default is enough and a hang fails sooner.

flutter/flutter@d463821...fffd8c2

2026-11-10 [email protected] Roll Fuchsia Test Scripts from 8QcsP_SmbsT09VgUs... to PXc5D7S_q6sIYpfFJ... (flutter/flutter#196273)
2026-11-10 [email protected] [web] Accept the capped letter spacing line shift in kitchensink (flutter/flutter#196148)
2026-11-10 [email protected] Fix Vulkan MSAA diagonal seam in FramebufferBlend (flutter/flutter#196197)
2026-11-10 [email protected] Read back images on the raster thread on OpenGLES (flutter/flutter#195927)
2026-11-10 [email protected] [web] Unify ui.Paint across CanvasKit and Skwasm (flutter/flutter#196071)
2026-11-10 [email protected] Roll Fuchsia Test Scripts from p3N3B-Kchh1bthB6n... to 8QcsP_SmbsT09VgUs... (flutter/flutter#196249)
2026-11-09 [email protected] [Impeller] Reland clipped BackdropFilter square corners fix (flutter/flutter#195716)
2026-11-09 [email protected] [web] Recreate canvas and context on CkOffscreenSurface resize to fix WebGL clipping (flutter/flutter#192769)
2026-11-09 [email protected] Roll Dart SDK from ee0f66fa0ad2 to a2baae273bb2 (1 revision) (flutter/flutter#196245)
2026-11-09 [email protected] Add Mac web_tool_tests_1_2 and _2_2 in bringup (flutter/flutter#196241)
2026-11-09 [email protected] Roll pub packages (flutter/flutter#196246)
2026-11-09 [email protected] Increase number of 'Windows tool_integration_tests' subshards (flutter/flutter#196243)
2026-11-09 [email protected] Roll Fuchsia Test Scripts from Jo-ZgQSNDuPsjlZ4s... to p3N3B-Kchh1bthB6n... (flutter/flutter#196238)
2026-11-09 [email protected] Skip UIScene pre-migration test cases on Xcode 27 (flutter/flutter#194755)
2026-11-09 [email protected] [flutter_tools] Share Analytics.isBot and make isRunningOnBot sync (flutter/flutter#194744)
2026-11-09 [email protected] [flutter_tools] Retry chromedriver startup when its port is taken (flutter/flutter#196150)
2026-11-09 [email protected] Remove unused vulkan_provider.cc (flutter/flutter#195513)
2026-11-09 [email protected] Roll Dart SDK from 3b174b7217fe to ee0f66fa0ad2 (13 revisions) (flutter/flutter#196217)
2026-11-09 [email protected] Goma is dead, long live RBE! (Take 2) (flutter/flutter#196212)
2026-11-09 [email protected] Split DevTools customer tests into its own customer_testing_devtools shard (flutter/flutter#195871)
2026-11-09 [email protected] Split mac_host_{debug,profile,release}_arm64_tests into one step per type (flutter/flutter#196031)

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Introduced in flutter#195871. Is passing
in post-submit:

https://ci.chromium.org/ui/p/flutter/builders/prod/Linux%20customer_testing_devtools/1/overview
(17 minutes)

Also drop `test_timeout_secs` which was copied from `customer_testing`.
The 30 minute default is now enough.


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…6277)

These overrides date from when the shards ran 30-45 minutes. After
flutter#195628, flutter#195863, and flutter#195871 their test steps take 9-20 minutes, so the
30 minute default is enough and a hang fails sooner.

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [AI contribution guidelines] and understand my
responsibilities, or I am not using AI tools.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [ ] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant in-code documentation (doc comments with
`///`).
- [x] If this PR introduces a new feature or capability, I created and
linked a website documentation issue or PR in [flutter/website] (or
verified none is needed).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
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If this change needs to override an active code freeze, provide a
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Flame only runs its full test suites on Linux, where it takes 7–9 min,
as long as the rest of the registry combined. Give it its own Linux
builder, the same way `customer_testing_devtools` was split out in
flutter#195871. Mac and Windows are
unchanged since flame is analysis-only there.

`Linux customer_testing` is the last build to finish in about half of
framework presubmit runs. It goes from ~22 min to ~13, and `Linux
customer_testing_flame` runs in ~10.

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [AI contribution guidelines] and understand my
responsibilities, or I am not using AI tools.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [ ] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant in-code documentation (doc comments with
`///`).
- [x] If this PR introduces a new feature or capability, I created and
linked a website documentation issue or PR in [flutter/website] (or
verified none is needed).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
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If this change needs to override an active code freeze, provide a
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