ci: Run rustfmt and python jobs on aarch64

The x86_64 shared runners often have long queues.
Move the rustfmt, python-artifacts, and yaml-toml-shell-py-test jobs to
use the aarch64 runners instead.

Signed-off-by: Valentine Burley <valentine.burley@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35000>

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

@@ -24,12 +24,14 @@
   interruptible: true
   stage: code-validation
   extends:
-    - .use-debian/x86_64_build
+    - .use-debian/arm64_build
   variables:
     GIT_STRATEGY: fetch
   timeout: 10m
   script:
     - git diff --color=always --exit-code  # Fails if there are diffs
+  tags:
+    - $FDO_RUNNER_JOB_PRIORITY_TAG_AARCH64
 
 rustfmt:
   extends:
@@ -78,7 +80,7 @@ shader-db:
 
 yaml-toml-shell-py-test:
   extends:
-    - .use-debian/x86_64_pyutils
+    - .use-debian/arm64_build
     - .no-auto-retry  # this job can't be flaky
   stage: code-validation
   script:
@@ -116,6 +118,8 @@ yaml-toml-shell-py-test:
       when: on_success
     - changes: *lint_files
       when: manual
+  tags:
+    - $FDO_RUNNER_JOB_PRIORITY_TAG_AARCH64
 
 .test-gl:
   extends: