Add a pause before creating MR on Gitlab to workaround a bug in Gitlab

[DBS-ST-VIT]

Gitlab currently has a bug that despite the configuration sometimes two pipelines for a merge request are started. See: https://gitlab.com/gitlab-org/gitlab/-/work_items/580101

In this post https://gitlab.com/gitlab-org/gitlab/-/work_items/580101#note_2915578156 someone mentioned that adding a pause between creating the commit and creating the MR has solved the issue for him.

We do have the same Problem with MR generated by renovate. So our idea was to add a pause before creating the MR. Length of the pause should be configurable with a default to 0.

This could be done in lib/modules/platform/gitlab/index.ts by modifying function createPr like this:

export async function createPr({
[...]
  logger.debug(`Creating Merge Request: ${title}`);
  const env = getEnv();
  const mergeCreateDelay = parseInteger(
        env.RENOVATE_X_GITLAB_CREATE_MERGE_REQUEST_DELAY,
        0,
      )
  await setTimeout(mergeCreateDelay * 1000); // use seconds
  const res = await gitlabApi.postJson<GitLabMergeRequest>(
[...]

I will create a pull request later on. Would be great if this could be merged quickly.

[DBS-ST-VIT]

Opened a pull request: #44795