ci: Disable gk20a-gles

This job may have some issue with its FDO_HTTP_CACHE_URI to download the
artifacts from S3.

Signed-off-by: Sergi Blanch Torne <sergi.blanch.torne@collabora.com>
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/11973
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31522>

src/gallium/drivers/nouveau/ci/gitlab-ci.yml

@@ -1,7 +1,7 @@
 include:
   - local: 'src/gallium/drivers/nouveau/ci/gitlab-ci-inc.yml'
 
-gk20a-gles:
+.gk20a-gles:
   extends:
     - .baremetal-test-arm32
     - .nouveau-bm-test