Store `enqueue_immediately` in Redis instead of database
# Problem As per https://gitlab.com/gitlab-org/gitlab/-/issues/271615, `enqueue_immediately` is considered processing data and we would need to move it away from `p_ci_builds_metadata`. The data is very short-lived. It's only set when retrying a manual job so that it can be enqueued immediately rather than transitioning from `failed` to `manual` and then require another user interaction. ## Solution This is a good candidate to be stored temporarily in Redis and we avoid having to cleanup this data from the database eventually.
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