ci/fdno: Only run full tests on a limited subset of machines

Though not many people run full test runs, it occupies 2/7 a630 slots
for nearly 2 hours. If more than one person does this at a time, it can
be an effective DoS and make merges time out.

Limit full runs to a subset of the runners, such that at least some of
them will always be available for us.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21737>

src/freedreno/ci/gitlab-ci.yml

@@ -237,6 +237,10 @@ a618_piglit:
   script:
     - ./install/bare-metal/cros-servo.sh
 
+.a630-full:
+  tags:
+    - google-freedreno-cheza-long
+
 a630_gl:
   extends:
     - .baremetal-deqp-test
@@ -294,6 +298,7 @@ a630_vk_full:
   timeout: 2h
   extends:
     - a630_vk
+    - .a630-full
     - .turnip-manual-rules
   parallel: 2
   variables: