Tests: retry timed out steps automatically

[aminya]

Description of the change

This automatically detects the timed out tests and reruns them.

This is much faster than rerunning the tests manually in Azure. This is because the rerunning happens at a low JavaScript level compared to CI reruns that need to set up the whole environment and rerun all the tests just because one was timed out.

Verification

The CI passes. The functions are commented with details.

Release Notes

N/A

[aminya]

After using this PR in @atom-ide-community, I did not have any timed-out tests that require manual retrying. Only real genuine test failures show themselves. #21292

[sadick254]

@aminya This looks great. I like the retrying bits of this PR. Could you clean your commits to make it ready for review?
This might supersede #21292

[aminya]

@sadick254 If we merge #21269 and #21262, we will be only 1 PR away from parallelizing the tests in #21109. After that, this will be cleaned automatically.

It will be hard to make this independent of #21109, as I have changed the way the tests run in that PR.

[sadick254]

@aminya needs rebasing

[aminya]

@sadick254 This is rebased! Ready to go.

If you want we can decrease the timeout interval instead of waiting for 12 seconds, and let our retry mechanism deal with it instead.

atom/spec/spec-helper.coffee

Lines 55 to 58 in 7a2cc45

	if process.env.CI
	jasmine.getEnv().defaultTimeoutInterval = 120000
	else
	jasmine.getEnv().defaultTimeoutInterval = 5000

[aminya]

Also, another note: I haven't run prettier on this script (to keep the diff small). If you are done reviewing, we should do that.

[sadick254]

If you want we can decrease the timeout interval instead of waiting for 12 seconds, and let our retry mechanism deal with it instead.

Lets leave it as it is for now.

[sadick254]

@aminya Thank you for your continuous contributions.