[pycodestyle] Add fix safety section to W291 and W293

[MeGaGiGaGon]

Summary

Part of #15584

This PR adds fix safety sections to W291 and W293

The unsafe caveat was added in #10049

ruff/crates/ruff_linter/src/rules/pycodestyle/rules/trailing_whitespace.rs

Line 92 in 10a1d9f

// Removing trailing whitespace is not safe inside multiline strings.

Code example demonstrating unsafety:

PS ~\Desktop\New_folder\ruff>Get-Content issue.py

# W291
"""
1
"""

# W293
"""

"""

PS ~\Desktop\New_folder\ruff>Get-Escaped-Content issue.py

# W291\n"""\n1 \n"""\n\n# W293\n"""\n \n"""\r\n

PS ~\Desktop\New_folder\ruff>uvx ruff check issue.py --isolated --select W

issue.py:3:2: W291 Trailing whitespace
  |
1 | # W291
2 | """
3 | 1
  |  ^ W291
4 | """
  |
  = help: Remove trailing whitespace

issue.py:8:1: W293 Blank line contains whitespace
  |
6 | # W293
7 | """
8 |
  | ^ W293
9 | """
  |
  = help: Remove whitespace from blank line

Found 2 errors.
No fixes available (2 hidden fixes can be enabled with the `--unsafe-fixes` option).

Test Plan

N/A, no tests affected.

[dylwil3]

Thank you!

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.