[anshurajbisoyi98-ctrl]

Fixes #2189.
Adds # isort: remove-redundant-aliases-off and

isort: remove-redundant-aliases-on action comments so selected

imports can retain explicit re-export aliases while still being sorted.
Each directive creates a sorting boundary, including with float_to_top.
The on directive restores the global setting. Directives inside strings
or sections disabled with # isort: off are ignored.
Regression tests cover ordinary and relative imports, LF and CRLF line
endings, repeated sorting, and restoring the global setting. The action
comment documentation describes the new behavior.
The directive names use redundant, matching the existing remove_redundant_aliases setting rather than the typo in the issue’s example.
Validation:

• Full unit suite: 687 passed, 1 skipped.
• Ruff lint and formatting checks passed.
• Mypy passed for 86 source files.
• All 12 new preservation regression cases failed before the fix and
  passed afterward.
  Ruff reported two existing invalid noqa warnings in unchanged files.
  Other Python versions, platforms, and integration tests were not tested.
  AI assistance: Codex assisted with implementation, regression tests,
  verification and documentation.

[DanielNoord]

See linked issue.