ci/zink: Disable a630 portal-2-v2 due to kernel OOMs.

It's been popular for flakes due to oomkilling or kernel kmalloc failure
recently.  Is it ultimately the source of running out of memory?  Who
knows, but hopefully it's at least a big part of the problem.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22083>

src/freedreno/ci/traces-freedreno.yml

@@ -58,7 +58,9 @@ traces:
           MESA: error: zink: couldn't allocate memory: heap=<heap> size=<size>
         Resulting in a segfault
     zink-a630:
+      label: [skip, flakes]
       checksum: b589b5d9ddd3026cbde08f0abe840ea7
+      text: seems to trigger oomkilling recently
 
   valve/counterstrike-source-v2.trace:
     freedreno-a306: