Run minimal rspec jobs before merge request is approved

What does this MR do?

Configures pipeline to run rspec jobs based on a merge request approval status.

• Before a merge request is approved:
  • rspec minimal jobs will be created, which runs rspec files that are related to the changes in the Merge Request
• After a merge request is approved:
  • full rspec jobs will be created, which runs all rspec files.

Expected result

• Shorter rspec job duration in merge requests that change backend code or database migrations
• No change in merge requests that only change frontend or QA

Part of #222369 (closed)

Verifications

Backend changes

Test Merge Request: !64910 (closed)

• pipeline before approval: https://gitlab.com/gitlab-org/gitlab/-/pipelines/329446625/builds
• pipeline after approval: https://gitlab.com/gitlab-org/gitlab/-/pipelines/329545913/builds

Baseline Merge Request: !64972 (closed)

• baseline pipeline: https://gitlab.com/gitlab-org/gitlab/-/pipelines/328661384/builds

Summary:

• Selected rspec tests are run based on the test mapping: https://gitlab.com/gitlab-org/gitlab/-/jobs/1388117599#L64, resulting in shorter average rspec job duration.

Mean job duration

Note: actual job duration may vary depending on number of tests needed for the MR

jobs	baseline pipeline - full tests	before approval pipeline - minimal tests	after approval pipeline - full tests
rspec unit pg12	21:24	11:08	21:03
rspec integration pg12	22:07	10:44	21:51
rspec system pg12	16:51	13:05	16:41
rspec-ee unit pg12	20:48	15:10	20:18
rspec-ee integration pg12	18:26	11:34	17:58
rspec-ee system pg12	20:51	14:24	20:58
rspec-ee unit pg12 geo	15:31	9:03	15:51
rspec-ee integration pg12 geo	6:41	5:01	7:06
rspec-ee system pg12 geo	9:01	4:20	8:49

Database changes

Test Merge Request: !64914 (closed)

• pipeline before approval: https://gitlab.com/gitlab-org/gitlab/-/pipelines/335241198/builds
• pipeline after approval: https://gitlab.com/gitlab-org/gitlab/-/pipelines/335349062/builds

Baseline Merge Request: !64972 (closed)

• baseline pipeline: https://gitlab.com/gitlab-org/gitlab/-/pipelines/328661384/builds

Summary:

• Only related database spec needs to be run: https://gitlab.com/gitlab-org/gitlab/-/jobs/1415978872#L60. This spec is run in the job https://gitlab.com/gitlab-org/gitlab/-/jobs/1415978949. Other rspec jobs don't have any tests to run, so they end immediately. Thus the average job duration is at ~2 minutes.

Mean job duration

Note: actual job duration may vary depending on number of tests needed for the MR

jobs	baseline pipeline - full tests	before approval pipeline - minimal tests	after approval pipeline - full tests
rspec migration pg12	21:24	2:23	21:33
rspec unit pg12	21:24	2:39	20:42
rspec integration pg12	22:07	2:18	21:21
rspec system pg12	16:51	2:21	16:56
rspec-ee migration pg12	20:48	2:56	18:21
rspec-ee unit pg12	20:48	2:45	21:21
rspec-ee integration pg12	18:26	2:49	17:00
rspec-ee system pg12	20:51	2:50	20:32
rspec-ee unit pg12 geo	15:31	2:48	15:04
rspec-ee integration pg12 geo	6:41	2:16	14:52
rspec-ee system pg12 geo	9:01	2:48	8:47

Frontend changes

Test Merge Request: !64913 (closed)

• pipeline before approval: https://gitlab.com/gitlab-org/gitlab/-/pipelines/328168028/builds
• pipeline after approval: https://gitlab.com/gitlab-org/gitlab/-/pipelines/335370218/builds

Baseline Merge Request: !64972 (closed)

• baseline pipeline: https://gitlab.com/gitlab-org/gitlab/-/pipelines/328661384/builds

Summary:

• Frontend change is not mapped to any specific rspec files, so it falls back to running all system specs.

Mean job duration

Note: actual job duration may vary depending on number of tests needed for the MR

jobs	baseline pipeline - full tests	before approval pipeline - minimal tests	after approval pipeline - full tests
rspec system pg12	16:51	16:03	16:41
rspec-ee system pg12	20:51	21:00	21:48

QA changes

Test Merge Request: !64912 (closed)

• !64913 (closed)
  • pipeline before approval: https://gitlab.com/gitlab-org/gitlab/-/pipelines/328166629/builds
  • pipeline after approval: https://gitlab.com/gitlab-org/gitlab/-/pipelines/335371810/builds

Baseline Merge Request: !64972 (closed)

• baseline pipeline: https://gitlab.com/gitlab-org/gitlab/-/pipelines/328661384/builds

Summary:

• No change to pipeline as there are no rspec jobs for QA changes.