NIFI-8422 added auto close/manager for stale PRs

[joewitt]

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Enables X functionality; fixes bug NIFI-YYYY.

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[pvillard31]

@joewitt - happy to merge this one, is it wip or can it be merged?

[exceptionfactory]

@joewitt - happy to merge this one, is it wip or can it be merged?

@pvillard31 The concept looks good, but the automated build failed due to the file not containing a license header, so that should be addressed prior to merging.