Rspec for Stop pipelines and jobs when over_storage_limit

What does this MR do and why?

Closes https://gitlab.com/gitlab-org/gitlab/-/issues/348735

When namespace storage limit is breached artifacts creation needs to be restricted, so as to avoid more breach of storage-limit, to stop creation of artifacts Pipeline and jobs are to be restricted. This MR just prevents Pipeline_creation when namespace storage is breached

Screenshots or screen recordings

Default Pipeline and Jobs pages, can "Run Pipeline" and "Retry" Jobs.

After over_storage_limit? is breached Pipeline and Jobs pages, can't "Run Pipeline" and can't "Retry" Jobs, can't see "Editor'"

How to set up and validate locally

Pre-Requiste

• Setup Runner and verify local pipeline is getting triggered
• Verify you can see the "Run Pipeline" button, navigate to <Project> > "CI/CD" > "Pipelines"
• Verify you can access and run the pipeline via http://127.0.0.1:3000/<username>/<project>/-/pipelines/new
• Verify you can see the "Retry" button, navigate to <Project> > "CI/CD" > "Jobs"
• Verify you can see the "Editor" button under <Project> > "CI/CD"

Validate "creating a pipeline" when over_storage_limit? is true

• Modify over_storage_limit? locally(for testing purposes), to return true
• Verify you can't see the "Run Pipeline" button via UI <Project> > "CI/CD" > "Pipelines" anymore
• Verify you can't access and run the pipeline via http://127.0.0.1:3000/<username>/<project>/-/pipelines/new it returns 404
• curl for running pipeline returns 404
• Verify "Editor" button is not visible, and access to the url returns 404
• Verify "Retry" Job is not available under <Project> > "CI/CD" > "Jobs"
• Verify "Retry" Pipleline results in 404

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.