Making mac-osxbeta-rel ,builderfull for Mac12 builder greening

added "builderless = False" to mac-osxbeta-rel, assigned bot
to mac-osxbeta-rel here https://chrome-internal-review.googlesource.com/c/infradata/config/+/4876222

Bug: 1294951
Change-Id: Id6d7387019670adc8bba7b483c3b148e084ce00f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3760913
Reviewed-by: Lindsay Pasricha <lindsayw@chromium.org>
Reviewed-by: Zhaoyang Li <zhaoyangli@chromium.org>
Commit-Queue: Rahul Kumar Adudodla <adudodla@google.com>
Cr-Commit-Position: refs/heads/main@{#1027920}

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

@@ -40029,13 +40029,11 @@ buckets {
     builders {
       name: "mac-osxbeta-rel"
       swarming_host: "chromium-swarm.appspot.com"
-      dimensions: "builderless:1"
+      dimensions: "builder:mac-osxbeta-rel"
       dimensions: "cores:8"
       dimensions: "cpu:x86-64"
-      dimensions: "free_space:standard"
-      dimensions: "os:Ubuntu-18.04"
+      dimensions: "os:Mac-12"
       dimensions: "pool:luci.chromium.ci"
-      dimensions: "ssd:0"
       exe {
         cipd_package: "infra/chromium/bootstrapper/${platform}"
         cipd_version: "latest"
@@ -74795,7 +74793,7 @@ buckets {
     builders {
       name: "mac-osxbeta-rel"
       swarming_host: "chromium-swarm.appspot.com"
-      dimensions: "builderless:1"
+      dimensions: "builder:mac-osxbeta-rel"
       dimensions: "cpu:x86-64"
       dimensions: "os:Mac-12"
       dimensions: "pool:luci.chromium.try"

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

@@ -750,6 +750,8 @@ ci.thin_tester(
         short_name = "beta",
     ),
     main_console_view = None,
+    builderless = False,
+    os = os.MAC_DEFAULT,
     triggered_by = ["ci/Mac Builder"],
 )
 

infra/config/subprojects/chromium/try/tryserver.chromium.mac.star

@@ -51,6 +51,7 @@ try_.builder(
         "ci/Mac Builder",
         "ci/mac-osxbeta-rel",
     ],
+    builderless = False,
     os = os.MAC_DEFAULT,
 )