ci/panfrost: Demote T720 to nightly runs only

We only have two of these boards, and can't get more as they're EOL.
Demote them to nightly until we can source different boards with this
SoC, and more of them.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35200>

src/panfrost/ci/gitlab-ci.yml

@@ -1,10 +1,12 @@
 include:
   - local: src/panfrost/ci/gitlab-ci-inc.yml
 
-.panfrost-t720-gles2:arm64:
+# 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:
   extends:
     - .lava-arm64-test-gl
-    - .panfrost-midgard-rules
+    - .panfrost-midgard-manual-rules
     - .panfrost-test
     - .lava-sun50i-h6-pine-h64:arm64