CI: Re-add CHANGED_FILES logic for pre-commit checks

[akien-mga]

• Follow-up to CI: Overhaul static checks to use pre-commit #91597.
• Fixes [CI] Style checks are broken #91831.

[AThousandShips]

Based on that some checks now show "passed" instead of "skipped" this seems to be working correctly

[Repiteo]

I'm curious if explicitly passing files overrides certain include/exclude logic; probably not a concern, but it's unfortunate that pre-commit doesn't have an automatic system for this

[AThousandShips]

It has an automatic system, it just doesn't work for existing commits, and doesn't seem to support listing a relative reference etc.

[akien-mga]

I'm curious if explicitly passing files overrides certain include/exclude logic

Seems fine:

$ git diff --staged
diff --git a/thirdparty/mbedtls/library/aes.c b/thirdparty/mbedtls/library/aes.c
index b1a5c3ed10..2fea85495c 100644
--- a/thirdparty/mbedtls/library/aes.c
+++ b/thirdparty/mbedtls/library/aes.c
@@ -4,6 +4,12 @@
  *  Copyright The Mbed TLS Contributors
  *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
  */
+
+
+
+
+
+
 /*
  *  The AES block cipher was designed by Vincent Rijmen and Joan Daemen.
  *
$ pre-commit run --files thirdparty/mbedtls/library/aes.c
clang-format.........................................(no files to check)Skipped
black................................................(no files to check)Skipped
mypy.................................................(no files to check)Skipped
codespell............................................(no files to check)Skipped
eslint-engine........................................(no files to check)Skipped
eslint-libs..........................................(no files to check)Skipped
eslint-sw............................................(no files to check)Skipped
eslint-html..........................................(no files to check)Skipped
make-rst.............................................(no files to check)Skipped
doc-status...........................................(no files to check)Skipped
jsdoc................................................(no files to check)Skipped
copyright-headers....................................(no files to check)Skipped
header-guards........................................(no files to check)Skipped
file-format..........................................(no files to check)Skipped
dotnet-format........................................(no files to check)Skipped