Remove CLANG_TIDY_ARGS to support run-clang-tidy (backport of #3640) (#3775)

Same fix as #3640 (main) and the equivalent humble/jazzy backports.
The run-clang-tidy script shipped in current kilted-ci Docker images
no longer accepts the `--fix --fix-errors --format-style=file` flags,
so any kilted PR that touches a file clang-tidy actually checks (like
PR #3774 touching moveit_setup_controllers) fails with:

    run-clang-tidy: error: unrecognized arguments:
      --fix --fix-errors --format-style=file
    'clang_tidy_check_moveit_setup_controllers' returned with code '123'

Drop the env var so run-clang-tidy gets invoked with its defaults.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: nbbrooks

.github/workflows/ci.yaml

@@ -29,7 +29,6 @@ jobs:
       # https://stackoverflow.com/a/41673702
       CXXFLAGS: >-
         -Wall -Wextra -Wwrite-strings -Wunreachable-code -Wpointer-arith -Wredundant-decls -Wno-unknown-warning-option
-      CLANG_TIDY_ARGS: --fix --fix-errors --format-style=file
       DOCKER_IMAGE: moveit/moveit2:${{ matrix.env.IMAGE }}
       UPSTREAM_WORKSPACE: >
         moveit2.repos