Ci resource group status transition (v2)

What does this MR do?

This MR is re-architecting !20903 (closed) with the proposal

Manual QA: Mon Dec 23 07:31:22 UTC 2019

.gitlab-ci.yml

test:
  script: echo 'a'
  resource_group: iOS

Case: When there is one test job

• Expectation: Users should see a running test job
• Result: Pass

Case: When there are two test jobs

• Expectation: Users should see a running and waiting test jobs
• Result: Pass

Case: When the first test job was canceled

• Expectation: Users should see the second test job is pending
• Result: Pass

Case: When the second test job succeeded

• Expectation: Users should see the second test job succeeded
• Result: Pass

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• [-] Label as security and @ mention @gitlab-com/gl-security/appsec
• [-] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• [-] Security reports checked/validated by a reviewer from the AppSec team