ci: remove clang-format testing

The way it's used is unacceptable. Here's the change it suggested:

    diff --git a/src/amd/vulkan/radv_device.c b/src/amd/vulkan/radv_device.c
    index 05b9cb0a3f1..e58abfa885f 100644
    --- a/src/amd/vulkan/radv_device.c
    +++ b/src/amd/vulkan/radv_device.c
    @@ -783,8 +783,7 @@ radv_CreateDevice(VkPhysicalDevice physicalDevice, const VkDeviceCreateInfo *pCr
        device->overallocation_disallowed = overallocation_disallowed;
        mtx_init(&device->overallocation_mutex, mtx_plain);

    -   if (physical_device->rad_info.register_shadowing_required ||
    -       device->instance->debug_flags & RADV_DEBUG_SHADOW_REGS)
    +   if (physical_device->rad_info.register_shadowing_required || device->instance->debug_flags & RADV_DEBUG_SHADOW_REGS)
           device->uses_shadow_regs = true;

        /* Create one context per queue priority. */

This is the dumbest reason to prevent merging a MR. I don't want to see this
in projects I work on.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23687>

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

@@ -30,24 +30,6 @@ rustfmt:
     - shopt -s globstar
     - rustfmt --check --verbose src/**/lib.rs
 
-clang-format:
-  # Cancel job if a newer commit is pushed to the same branch
-  interruptible: true
-  stage: lint
-  extends:
-    - .use-debian/x86_64_build
-    - .lint-clang-format-rules
-  variables:
-    GIT_STRATEGY: fetch
-    LLVM_VERSION: 15
-  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
-    - ninja -C build clang-format
-    - git diff --color=always --exit-code  # Fails if there are diffs
-
 .test-gl:
   extends:
     - .test