[ruff] fix async comprehension false positive (RUF029)

[JonathanPlasse]

Summary

• Fix RUF029 trigger errors on async interators #11043

Test Plan

Added the false positive code in the test fixture.

[charliermarsh]

Hey @JonathanPlasse, great to see you on the repo!

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

ℹ️ ecosystem check detected linter changes. (+0 -5 violations, +0 -0 fixes in 2 projects; 42 projects unchanged)

DisnakeDev/disnake (+0 -1 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --ignore RUF9 --output-format concise --preview

- tests/test_utils.py:706:11: RUF029 Function `test_as_chunks` is declared `async`, but doesn't `await` or use `async` features.

RasaHQ/rasa (+0 -4 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --ignore RUF9 --output-format concise --preview

- tests/core/evaluation/test_marker_tracker_loader.py:137:11: RUF029 Function `test_warn_count_exceeds_store` is declared `async`, but doesn't `await` or use `async` features.
- tests/core/test_exporter.py:111:11: RUF029 Function `test_fetch_events_within_time_range_tracker_does_not_err` is declared `async`, but doesn't `await` or use `async` features.
- tests/core/test_exporter.py:123:11: RUF029 Function `test_fetch_events_within_time_range_tracker_contains_no_events` is declared `async`, but doesn't `await` or use `async` features.
- tests/core/test_exporter.py:72:11: RUF029 Function `test_fetch_events_within_time_range` is declared `async`, but doesn't `await` or use `async` features.

Changes by rule (1 rules affected)

code	total	+ violation	- violation	+ fix	- fix
RUF029	5	0	5	0	0

[JonathanPlasse]

Thanks