Do not start this work if the new headers are not on master

Scope

• Add the "exit to classic" link to both the header of application and to the run modal

App header

Run header

Original request
If I navigate to a Pipeline, deep within a GitHub Organization Folder, it's impossible to quickly get to the "classic" UI with my current browsing context.

If I want to get from a detail page for a pull request run, I need to open a new window, click the folder, click the repository, click pull requests, click the appropriate pull request job, then click the build number.

It would be nicer if there was a little link in the header of the detail page which allowed me to "view in classic" or something like that. That way I could easily go from this detail view to this classic page without wanting to flip my desk.