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

.github/ISSUE_TEMPLATE/bug_report.md

@@ -2,7 +2,7 @@
 name: Bug report
 about: Create a report to help us improve OpenZFS
 title: ''
-labels: 'Type: Defect'
+labels: 'Type: Defect', 'Status: Triage Needed'
 assignees: ''
 
 ---

.github/stale.yml

@@ -7,7 +7,14 @@ only: issues
 # Issues with these labels will never be considered stale
 exemptLabels:
   - "Type: Feature"
-  - "Type: Understood"
+  - "Bot: Not Stale"
+  - "Status: Work in Progress"
+# Set to true to ignore issues in a project (defaults to false)
+exemptProjects: true
+# Set to true to ignore issues in a milestone (defaults to false)
+exemptMilestones: true
+# Set to true to ignore issues with an assignee (defaults to false)
+exemptAssignees: true
 # Label to use when marking an issue as stale
 staleLabel: "Status: Stale"
 # Comment to post when marking an issue as stale. Set to `false` to disable
@@ -15,3 +22,5 @@ markComment: >
   This issue has been automatically marked as "stale" because it has not had
   any activity for a while. It will be closed in 90 days if no further activity occurs. 
   Thank you for your contributions.
+# Limit the number of actions per hour, from 1-30. Default is 30
+limitPerRun: 6