Setup custom reporters after default reporters

[aaronabramov]

Custom reporter experience is not great right now and it's pretty hard to customize.
Right now even if we pass this to config:

{reporters: ['custom1.js', 'default', 'custom2.js']}

the order will be:

• default reporters
• custom reporters
• coverage/notify reporters

and that makes it hard to customize reporters that interact with coverage data. (coverage data is never available in custom reporters, because CoverageReporter is always last in the queue).

This requires a better fix (#4052), but for now i want to move custom reporters to the very end, so they're run after all default reporters are done

[github-actions]

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