CI: Disable Panfrost T860 and AMD Stoney tests

Due to scheduled physical lab maintenance to prepare for expansion and
better shard our device types across redundant infrastructure, these
device types will be inaccessible for approx. 3 hours. Disable them
until they are back.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6302>
diff --git a/.gitlab-ci/lava-gitlab-ci.yml b/.gitlab-ci/lava-gitlab-ci.yml
index d5a51ce..be70bf5 100644
--- a/.gitlab-ci/lava-gitlab-ci.yml
+++ b/.gitlab-ci/lava-gitlab-ci.yml
@@ -201,14 +201,14 @@
   tags:
     - mesa-ci-aarch64-lava-collabora
 
-panfrost-t860-gles2:arm64:
+.panfrost-t860-gles2:arm64:
   extends:
     - .lava-test:arm64
     - .lava-rk3399-gru-kevin
   variables:
     ENV_VARS: "PAN_MESA_DEBUG=gles3 DEQP_PARALLEL=6 DEQP_EXPECTED_RENDERER=T860"
 
-panfrost-t860-gles3:arm64:
+.panfrost-t860-gles3:arm64:
   parallel: 2
   extends:
     - .lava-test:arm64
@@ -217,7 +217,7 @@
     DEQP_VERSION: gles3
     ENV_VARS: "PAN_MESA_DEBUG=gles3 DEQP_PARALLEL=6 DEQP_EXPECTED_RENDERER=T860"
 
-panfrost-t860-traces:arm64:
+.panfrost-t860-traces:arm64:
   extends:
     - .lava-traces:arm64
     - .lava-rk3399-gru-kevin
@@ -286,7 +286,7 @@
   tags:
     - mesa-ci-aarch64-lava-collabora
 
-radeonsi-stoney-traces:amd64:
+.radeonsi-stoney-traces:amd64:
   extends:
     - .lava-traces:amd64
     - .radeonsi-rules