PoC: Support Resource Group For Cross-Project pipelines

What does this MR do?

This MR provides PoC for Support Resource Group for cross-project and parent-child pipelines

Example: Parent-Child Pipelines

# .gitlab-ci.yml (parent)

deploy-downstream:
  trigger:
    include: child.gitlab-ci.yml
    strategy: depend
  resource_group: iOS                # New

# child.gitlab-ci.yml (child)

deployment:
  script: sleep 5s

Bridge jobs (concurrent deployment pipelines) are correctly waiting for the current deployment pipeline has finished.

Example: Cross-Project Pipelines

# .gitlab-ci.yml (upstream project)

deploy-downstream:
  trigger:
    project: root/cross-project-resource-group-downstream
    strategy: depend
  resource_group: iOS

# .gitlab-ci.yml (downstream project)

deployment:
  script: sleep 5s

Bridge jobs (concurrent deployment pipelines) are correctly waiting for the current deployment pipeline has finished.

Screenshots (strongly suggested)

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
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

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