Fix dictionary code width for nullable primitive values - #11165

## Summary

Follow-up to #11110. Keep the remaining noisy cases out of automatic
CodSpeed runs while preserving them for local benchmarks.

The Python scalar exclusions in #11110 never took effect because the
runner exports simulation as `instrumentation`, while the fixture
checked for `simulation`. Use the plugin's resolved mode so these cases
are actually skipped.

## Changes

- Allow a trailing comma in `#[divan::bench(...)]` when the CPU-feature
macro appends its options. The multiline bitpacked take definition
covers this case in CI builds.
- Share the resolved simulation check between the scalar and filter
fixtures. Also skip the 2 integer one-shot filtered scans that still
report system calls under simulation.
- Keep AVX2 bitpacked take with 80 selections local after batching still
produced a regression alert. Retain the 64-selection case and both
AVX-512 cases in CI.
- Keep AVX-512 nullable integer comparison local because its minimum
changes by more than 10% while its median stays stable.
- Keep the small random power-law boolean filter and the large
correlated power-law boolean filter local under simulation. The former
has repeated unexplained changes, and the latter repeatedly makes system
calls that simulation cannot measure.

<details>
<summary>Evidence from recent PR reports</summary>

Reviewed 40 CodSpeed report comments updated between November 2 at 19:28
UTC and November 3 at 19:28 UTC, including their comparison revisions
and the affected measurement modes.

| Case | Evidence |
| --- | --- |
| Python integer scalar scans |
[#11154](#11154 (comment))
still reports the repeated scan's 10 system calls. [A develop run after
#11110](https://github.com/vortex-data/vortex/actions/runs/41677647530/job/126062463160)
executes both integer scalar cases instead of skipping them. The [runner
exports the legacy `instrumentation`
value](https://github.com/CodSpeedHQ/codspeed/blob/main/crates/runner-shared/src/measurement_mode.rs),
which pytest-codspeed 5.0.3 normalizes to simulation. |
| Python integer filtered scans |
[#11130](#11130 (comment))
reports 30 system calls totaling 14.3 ms in `test_scan_filter[int]`.
[#11138](#11138 (comment))
reports 30 calls totaling 16.3 ms in
`test_scan_filter_to_arrow_array[int]`. |
| AVX2 `threshold[80]` |
[#11004](#11004 (comment))
compares `f7b5b1d864` with `e59b236d7b`: 2.183 to 2.531 µs, reported as
a 13.75% regression. Both use 1000 samples of 16 iterations. The head
median is 2.556 µs, so this is not just a single outlying minimum. The
PR does not change the fastlanes code or benchmark. |
| AVX-512 `lt_i64_nullable` |
[#11168](#11168 (comment))
reports 7.342 to 8.217 µs. Several unrelated CUDA PRs report the
opposite direction, including
[#10872](#10872 (comment)),
at 8.208 to 7.348 µs. Their head medians remain around 8.3 to 8.5 µs. |
| Boolean `filter_powerlaw_by_random[10000]` |
[#11167](#11167 (comment))
reports a 16.2% regression,
[#11168](#11168 (comment))
a 23.56% improvement, and
[#11169](#11169 (comment))
a 13.06% regression. The cause is unknown. |
| Boolean `filter_powerlaw_by_correlated_runs[100000]` |
[#10871](#10871 (comment))
and
[#11165](#11165 (comment))
each report 2 system calls totaling about 44 µs. |

The NEON chunked-take alerts on #11090 are on a PR that changes
execution substantially, so those cases remain enabled. Other dictionary
simulation alerts need more attribution before excluding them.

</details>

CI passes formatting, Python lint and script tests, Rust lint,
default-feature and all-feature Rust builds, all 3 CPU walltime
benchmark jobs, and Python benchmarks (36 passed, 4 intentionally
skipped). The previously failed simulation shard also passes. Some
remaining CI jobs and CodSpeed performance analysis are still pending.

No local checks were run. The pre-commit and pre-push hooks were
bypassed as requested.

---------

Signed-off-by: Connor Tsui <[email protected]>