Don't garden linux-arm64-cast-rel for now

The builder is being stabilized and can be gardened again after.

Bug: 332735845
Change-Id: I5420c61f189f21136a371bd18bbe97503dcdf322
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5436134
Reviewed-by: Mark Foltz <mfoltz@chromium.org>
Commit-Queue: Erik Staab <estaab@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1284080}

infra/config/generated/builders/ci/linux-arm64-cast-rel/properties.json

@@ -73,8 +73,5 @@
     ]
   },
   "builder_group": "chromium.linux",
-  "recipe": "chromium",
-  "sheriff_rotations": [
-    "chromium"
-  ]
+  "recipe": "chromium"
 }

infra/config/generated/cq-usage/mega_cq_bots.txt

@@ -76,7 +76,6 @@ chromium/try/lacros-arm-generic-rel
 chromium/try/lacros-arm-generic-rel-skylab
 chromium/try/lacros-arm64-generic-rel-skylab
 chromium/try/layout_test_leak_detection
-chromium/try/linux-arm64-cast-rel
 chromium/try/linux-asan-dbg
 chromium/try/linux-asan-media-rel
 chromium/try/linux-asan-media-v8-arm-rel

infra/config/generated/luci/cr-buildbucket.cfg

@@ -43313,10 +43313,7 @@ buckets {
         '  },'
         '  "builder_group": "chromium.linux",'
         '  "led_builder_is_bootstrapped": true,'
-        '  "recipe": "chromium",'
-        '  "sheriff_rotations": ['
-        '    "chromium"'
-        '  ]'
+        '  "recipe": "chromium"'
         '}'
       execution_timeout_secs: 10800
       build_numbers: YES

infra/config/generated/sheriff-rotations/chromium.txt

@@ -95,7 +95,6 @@ ci/lacros-arm-generic-rel
 ci/lacros-arm-generic-rel-skylab
 ci/lacros64-archive-rel
 ci/linux-archive-rel
-ci/linux-arm64-cast-rel
 ci/linux-bfcache-rel
 ci/linux-cfm-rel
 ci/linux-chromeos-archive-rel

infra/config/subprojects/chromium/ci/chromium.linux.star

@@ -114,6 +114,8 @@ ci.builder(
             "minimal_symbols",
         ],
     ),
+    # TODO(crbug.com/332735845): Garden this once stabilized.
+    sheriff_rotations = args.ignore_default(None),
     tree_closing = False,
     console_view_entry = consoles.console_view_entry(
         category = "cast",