Check whitespace in all files except bytecode and image/vector files (o…

…penxla#2130)

The root cause of openxla#2129 is that Python files (ending in `.py`) were
excluded from the whitespace check. I originally proposed expanding the
list of included files to include Python files, but @ghpvnist pointed
out that there are more files that need this check than files that don't
and suggested using an exclude list, so I did that instead.

Also, use `-E` and rewrite the pattern to allow the exclude list to be
expanded more easily in the future.

Fixes openxla#2129

build_tools/github_actions/lint_whitespace_checks.sh

@@ -40,7 +40,7 @@ if [[ $# -ne 0 ]] ; then
 fi
 
 echo "Gathering changed files..."
-mapfile -t CHANGED_FILES < <(git diff "$BASE_BRANCH" HEAD --name-only --diff-filter=d | grep '.*\.cpp$\|.*\.h$\|.*\.md$\|.*\.mlir$\|.*\.sh$\|.*\.td$\|.*\.txt$\|.*\.yml$\|.*\.yaml$')
+mapfile -t CHANGED_FILES < <(git diff "$BASE_BRANCH" HEAD --name-only --diff-filter=d | grep -Ev '.*\.(bc|png|svg)$')
 if (( ${#CHANGED_FILES[@]} == 0 )); then
   echo "No files to check."
   exit 0