When a user clicked on another page in the pipeline page, the following
would happen:
1. PipelinesService.getPipelines() would be called to fetch the new page
2. In the success handler, Poll.restart() would be called
3. This would invoke Poll.makeRequest(), which would fire off a new
request.
To fix this, we introduce a enable(), which will:
1. Update the request data accordingly
2. Clear the old timeout if necessary and start a new timer
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/58095
Correctly waits for requests to finish before testing anything.
Previously it was waiting for a set amount of time which could possibly
cause failures dependant on how quickly these execute
Stops any polling requests once done so that the error callback doesn't
get called with a 404
Closes#30824
Stan Hu
Mike Greiling
Filipa Lacerda
Simon Knox
Luke "Jared" Bennett
Phil Hughes