WIP: Experiment with DAG for all MR jobs in post-test

What does this MR do?

I have had the observation that the jobs in the post-test stage wait for all the review-app and qa process but with the exception of parallel-spec-reports didn't really have a requirement that I was aware of to wait.

This MR is attempting to decouple all the jobs in the post-test stage from waiting until qa completes for all non-qa branches.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry for user-facing changes, or community contribution. Check the link for other scenarios.
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Performance 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