Inline trailing comments for type alias similar to assignments

[MichaReiser]

Summary

This PR aligns the comment formatting for type aliases with the assignment formatting.

Black and Ruff inline a trailing assignment comment into the parentheses of the value if the value gets parenthesized.
Neither Black or Ruff apply this layout for type assignments today. To me, this feels inconsistent because type alias statements are just a specific form of assignment.

Note that this is a Black divergence. Depending on the ecosystem check results, we should consider hiding this behind preview for now. Although I don't expect this to be common, considering that type aliases are new.

Test Plan

Added tests.

The similarity index remain unchanged.

project	similarity index	total files	changed files
cpython	0.75804	1799	1648
django	0.99984	2772	34
home-assistant	0.99955	10596	213
poetry	0.96208	317	35
transformers	0.99967	2657	324
twine	1.00000	33	0
typeshed	0.99980	3669	18
warehouse	0.99976	654	14
zulip	0.99957	1459	36

[MichaReiser]

Current dependencies on/for this PR:

• main
  • PR Refactor the comment handling of a statement's last expression #8920
    • PR prefer_splitting_right_hand_side_of_assignments preview style #8943
      • PR Implement Black's parenthesize-long-type-hints preview style #9102
    • PR Inline trailing comments for type alias similar to assignments #8941 👈
      • PR Ignore the open parentheses when measuring BestFitsParenthesize #8940

This stack of pull requests is managed by Graphite.

[charliermarsh]

I think this is correct.

[github-actions]

ruff-ecosystem results

Formatter (stable)

✅ ecosystem check detected no format changes.

Formatter (preview)

✅ ecosystem check detected no format changes.