FabricBot: Onboarding to GitOps.ResourceManagement because of FabricB…

…ot decommissioning (#6221)

Add prIssueManagement.yml to onboard repo to GitOps.ResourceManagement
as FabricBot replacement

Owners of the FabricBot configuration should have received email
notification. The same information contained in the email is published
internally at: https://aka.ms/gim/fabricbot. Details on the replacement
service and the syntax of the new yaml configuration file is available
publicly at:
https://microsoft.github.io/GitOps/policies/resource-management.html

Please review and merge this PR to complete the process of onboarding to
the new service.

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Co-authored-by: microsoft-github-policy-service[bot] <77245923+microsoft-github-policy-service[bot]@users.noreply.github.com>