StaleBot Tweaks

StaleBot Tweaks

- Add Status: Triage Needed to bug reports

Currently "Type: Defect" is auto added.
Adding a triage tag, makes sure all issues are reviewed by a maintainer
It also opens up some options to priorities defects in the near future.

- Prevent future StaleBot Spam

StaleBot will limit itself to 6 actions per hour
This should prevent future floods of StaleBot activity
(aka Spam)

- StaleBot: Ignore issues that are being worked on

Ignore the following Issues:
- tagged: "Status: Work in Progress"
- Having a maintainer assigned
- Being part of a project
- Having a milestone tag

- Rename Ignore "Type: Understood" to "Bot: Not Stale"

This Commits changes the general ignore tag for StaleBot from:
 "Type: Understood"
to
"Bot: Not Stale"

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Kjeld Schouten-Lebbing <kjeld@schouten-lebbing.nl>
Closes #10813