ci/panfrost: Disable DUTs under maintenance

Collabora's farm 2025-07-31 maintenance will make the following DUTs
offline for a few hours:
  - rk3288-veyron-jaq
  - sun50i-h6-pine-h64

So let's disable them before it blocks the pipelines.

----

Planned downtime for those DUTs in the farm:

Start: 2025-07-31 08:00 BST
End: 2025-07-31 10:00 BST

Signed-off-by: Guilherme Gallo <guilherme.gallo@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36480>

src/panfrost/ci/gitlab-ci.yml

@@ -3,7 +3,8 @@ include:
 
 # We only have two machines and these boards are EOL.
 # Put it in nightly until we can move to different boards.
-panfrost-t720-gles2:arm64:
+# Temporarly disabled for 2025-07-31 maintainance
+.panfrost-t720-gles2:arm64:
   extends:
     - .lava-arm64-test-gl
     - .panfrost-midgard-manual-rules
@@ -12,7 +13,8 @@ panfrost-t720-gles2:arm64:
 
 # We only have two machines, which we share with KernelCI.
 # Keep the second t760 job manual.
-panfrost-t760-gles:arm32:
+# Temporarly disabled for 2025-07-31 maintainance
+.panfrost-t760-gles:arm32:
   extends:
     - .lava-arm32-test-gl
     - .panfrost-midgard-manual-rules
@@ -20,7 +22,8 @@ panfrost-t760-gles:arm32:
     - .lava-rk3288-veyron-jaq:arm32
   timeout: 1h 30m
 
-panfrost-t760-traces:arm32:
+# Temporarly disabled for 2025-07-31 maintainance
+.panfrost-t760-traces:arm32:
   extends:
     - .lava-arm32-piglit-traces
     - .panfrost-midgard-manual-rules