[flake8-type-checking] Fix syntax error introduced by fix (TC008)

[MeGaGiGaGon]

Summary

I noticed this while working on #18972. If the string targeted by quoted-type-alias (TC008) is a multiline string, the fix would introduce a syntax error. This PR fixes that by adding parenthesis around the resulting replacement if the string contained any newline characters (\n, \r) if it doesn't already have parenthesis outside ("""...""") or inside """(...)""" the annotation.

Failing examples: https://play.ruff.rs/8793eb95-860a-4bb3-9cbc-6a042fee2946

PS D:\rust_projects\ruff> Get-Content issue.py

from typing import TypeAlias

OptInt: TypeAlias = """int
| None"""

type OptInt = """int
| None"""

PS D:\rust_projects\ruff> uvx ruff check issue.py --isolated --select TC008 --fix --diff --preview

error: Fix introduced a syntax error. Reverting all changes.

This indicates a bug in Ruff. If you could open an issue at:

    https://github.com/astral-sh/ruff/issues/new?title=%5BFix%20error%5D

...quoting the contents of `issue.py`, the rule codes TC008, along with the `pyproject.toml` settings and executed command, we'd be very appreciative!

This PR also makes the example error out-of-the-box for #18972

Old example: https://play.ruff.rs/f6cd5adb-7f9b-444d-bb3e-8c045241d93e

OptInt: TypeAlias = "int | None"

New example: https://play.ruff.rs/906c1056-72c0-4777-b70b-2114eb9e6eaf

from typing import TypeAlias

OptInt: TypeAlias = "int | None"

The import was also added to the "Use instead" section.

Test Plan

Added multiple test cases

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.

[dylwil3]

Thank you!