ci: re-enable until front of line blocking in publish snapshot job (#25602)

We had to temporarily disable the CircleCI orb command that helps
ensuring snapshot jobs do not conflict when running concurrently.

It seems like the CircleCI API has been fixed to no longer cause
issues with the Orb. This commit attempts to re-enable the command.

(cherry picked from commit fd9d326)

Author: devversion

.circleci/config.yml

@@ -461,9 +461,8 @@ jobs:
       # after a delay. We do this as the CircleCI API does not refresh immediately when a job
       # completes/starts, and this will improve stability of the queue step. See source:
       # https://github.com/eddiewebb/circleci-queue/commit/5d42add5bbcff5e8ac7fe189448a61fea98b0839.
-      # TODO(devversion): re-enable once https://github.com/eddiewebb/circleci-queue/issues/79 is resolved.
-      # - queue/until_front_of_line:
-      #    confidence: '2'
+      - queue/until_front_of_line:
+          confidence: '2'
 
       - run: ./scripts/circleci/publish-snapshots.sh
       - *slack_notify_on_failure