NIFI-14996: Updating the BulletinRepository API to support methods fo…

[mcgilman]

…r clearing component bulletins.

Summary

NIFI-14996

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[exceptionfactory]

Thanks for putting this together @mcgilman. Instead of using java.util.Date, it seems like it would be better to use one of the more specific java.time classes. The java.time.Instant seems like the most logical option, and also supports simple transformation to and from java.util.Date if needed.

[exceptionfactory]

Thanks for making the adjustment @mcgilman, this looks good. +1 merging