This reverts merge request !23165

Let users know we do two Helm releases if they specify DB_INITIALIZE.

Auto DevOps deployment strategies now supports timed incremental
rollout. We are deprecating the usage of INCREMENTAL_ROLLOUT_ENABLED
environment variable in Auto DevOps template.

The new behavior will be driven by the INCREMENTAL_ROLLOUT_MODE variable
that can either be manual (same as INCREMENTAL_ROLLOUT_ENABLED) or
timed.

Rollout deployments will be executed using a 5 minute delay between each
job.

* Limitation of DB_INITIALIZE (run once)
* helm hooks
* Examples

Originally submitted at
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/6724.
Signed-off-by: NRémy Coutable <remy@rymai.me>

Minor typo fix CODE_QUALITY seems to have a `_` in it in .gitlab-ci.yml default templates, and to wit, without `_` seems to have no effect

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

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