Adding Alert Processing Rule flexibility based on severity filters

[Alboroni]

Overview/Summary

Update to allow deployment of multiple alert processing rules based on different severity in the same subscription.

This PR fixes/adds/changes/removes

Adds to Deploy-AlertProcessingRule-Deploy.json and Deploy-Notification-Assets.json

Breaking Changes

None - We are adding two more parameters one for selecting the alert severity and one to changing the alert processing rule and description to avoid policy compliance issues

As part of this Pull Request I have

• [x ] Read the Contribution Guide and ensured this PR is compliant with the guide
• [ x] Checked for duplicate Pull Requests
• Associated it with relevant GitHub Issues or ADO Work Items (Internal Only)
• Ensured my code/branch is up-to-date with the latest changes in the main branch
• Ensured PR tests are passing
• [x ] Updated relevant and associated documentation (e.g. Contribution Guide, Docs etc.)

[Brunoga-MS]

@Alboroni : I was able to resolve all the conflicts and to make other changes directly into your branch. I also left some comments on something I changed/fixed/added. Please give it another try and let me know. What I am also thinking about is: why don't we create one APR per severity so customer can decide to disable the one(s) they do not need?

[Alboroni]

All good will test

[Brunoga-MS]

LTGM