Add IdleMrHelper plugin so we load it for policies
What does this MR do and why?
- Add IdleMrHelper plugin so we load it for policies
- Use module_functionbecause we don't need context for that
Expected impact & dry-runs
Action items
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(If applicable) Add documentation to the handbook pages for Triage Operations => 
- (If applicable) Identify the affected groups and how to communicate to them:
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/cc @ person_or_group=>
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Relevant Slack channels => 
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Engineering week-in-review 
 
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Closes #916 (closed)
Edited  by Lin Jen-Shin