ci: disable clang-format job

this is still killing merge pipelines

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27831>

.gitlab-ci/test-source-dep.yml

@@ -238,26 +238,3 @@
     - changes: *rust_file_list
       when: on_success
       allow_failure: true
-
-.lint-clang-format-rules:
-  rules:
-    - !reference [.never-post-merge-rules, rules]
-    - !reference [.core-rules, rules]
-    # in merge pipeline, formatting checks are not allowed to fail
-    - if: $GITLAB_USER_LOGIN == "marge-bot" && $CI_PIPELINE_SOURCE == "merge_request_event"
-      changes: &clang_format_file_list
-        - .clang-format
-        - .clang-format-include
-        - .clang-format-ignore
-        - src/**/.clang-format
-        - src/egl/**/*
-        - src/amd/vulkan/**/*
-        - src/amd/compiler/**/*
-        - src/etnaviv/isa/**/*
-        - src/gallium/targets/teflon/**/*
-      when: on_success
-      allow_failure: false
-    # in other pipelines, formatting checks are allowed to fail
-    - changes: *clang_format_file_list
-      when: on_success
-      allow_failure: true

.gitlab-ci/test/gitlab-ci.yml

@@ -43,21 +43,6 @@ rustfmt:
     - rustfmt --verbose src/**/lib.rs
     - rustfmt --verbose src/**/main.rs
 
-clang-format:
-  extends:
-    - .formatting-check
-    - .lint-clang-format-rules
-  variables:
-    LLVM_VERSION: 15
-  before_script:
-    - shopt -s globstar
-    # We need a meson build dir, but its config doesn't actually matter, so
-    # let's just use the default.
-    - meson setup build
-    - clang-format-${LLVM_VERSION} --version
-    - ninja -C build clang-format
-  allow_failure: true
-
 .test-check:
   # Cancel job if a newer commit is pushed to the same branch
   interruptible: true