Fix incorrect placement of leading function comment with type params

[MichaReiser]

Summary

Fixes #12430

@decorator
# remark
def foo[S](x: S) -> S: ...

was formatted to

@decorator
def foo# remark
[S](x: S) -> S: ...

This PR marks the # remark as dangling comment and formats it between the decorator and the function header.

Test Plan

Added tests. I also added test for classes.

[github-actions]

ruff-ecosystem results

Formatter (stable)

ℹ️ ecosystem check encountered format errors. (no format changes; 1 project error)

openai/openai-cookbook (error)

warning: Detected debug build without --no-cache.
error: Failed to parse examples/chatgpt/gpt_actions_library/gpt_action_canvaslms.ipynb:15:1:1: Expected an expression
error: Failed to parse examples/chatgpt/gpt_actions_library/gpt_action_outlook.ipynb:13:1:1: Expected an expression
error: Failed to parse examples/chatgpt/gpt_actions_library/gpt_action_salesforce.ipynb:17:1:13: Simple statements must be separated by newlines or semicolons

Formatter (preview)

ℹ️ ecosystem check encountered format errors. (no format changes; 1 project error)

openai/openai-cookbook (error)

ruff format --preview

warning: Detected debug build without --no-cache.
error: Failed to parse examples/chatgpt/gpt_actions_library/gpt_action_canvaslms.ipynb:15:1:1: Expected an expression
error: Failed to parse examples/chatgpt/gpt_actions_library/gpt_action_outlook.ipynb:13:1:1: Expected an expression
error: Failed to parse examples/chatgpt/gpt_actions_library/gpt_action_salesforce.ipynb:17:1:13: Simple statements must be separated by newlines or semicolons