Return to development changelog status.

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## Summary by CodeRabbit

- **Documentation**
- Added an "Unreleased" section to the changelog for tracking future
updates.

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This adds support for a 3rd option for creating mocks after reflect and
source-mode: the archive mode. Archive mode lets you load archive files
to create mocks. This can come in handy for writing Bazel rules that
produce intermediary archive files and automatically codegen mocks in
Bazel environments.

Rebased version of #125

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Co-authored-by: Zhongpeng Lin <[email protected]>
Co-authored-by: Sung Yoon Whang <[email protected]>
Co-authored-by: Sung Yoon Whang <[email protected]>

Removes the broken reflect mode in the bazel aspect, in favor of archive
mode which was landed in #258

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Co-authored-by: Zhongpeng Lin <[email protected]>

Hi! In #259 was introduced archive mode for bazel rule, but no support
for mock_names.
This PR added `mock_names` attr to `_gomock_archive` rule.

Fixes #274.

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Co-authored-by: Jacob Oaks <[email protected]>

go1.25 was released, let's test it in CI.

This includes fixes for go1.25 and the new archive mode.