ci: split hidden job definition for bare-metal and ci-tron

The job definitions for lava-related jobs are encapsulated in a directory,
while the other two farm managers were in the generic test directory. Having a
directory for ci-tron places it side by side with other farm managers. For
bare-metal, it has another advantage, as this encapsulates elements related to
this farm manager in a single place.

To maintain simplicity and consistency in file naming, the gitlab-ci file in
the lava directory is renamed as it has a prefix that corresponds with the
directory hosting it. The other farm equivalent files don't include this
duplication as a prefix, and there isn't such a prefix in any other case of
the CI.

Signed-off-by: Sergi Blanch-Torne <sergi.blanch.torne@collabora.com>
Acked-by: Martin Roukala (né Peres) <martin.roukala@mupuf.org>
Reviewed-by: Eric Engestrom <eric@igalia.com>
Reviewed-by: Valentine Burley <valentine.burley@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35427>

.gitlab-ci.yml

@@ -213,7 +213,9 @@ include:
     ref: *ci-tron-template-commit
     file: '/.gitlab-ci/dut.yml'
   - local: '.gitlab-ci/image-tags.yml'
-  - local: '.gitlab-ci/lava/lava-gitlab-ci.yml'
+  - local: '.gitlab-ci/bare-metal/gitlab-ci.yml'
+  - local: '.gitlab-ci/ci-tron/gitlab-ci.yml'
+  - local: '.gitlab-ci/lava/gitlab-ci.yml'
   - local: '.gitlab-ci/container/gitlab-ci.yml'
   - local: '.gitlab-ci/build/gitlab-ci.yml'
   - local: '.gitlab-ci/test/gitlab-ci.yml'