feat: avm/ptn/authorization/policy assignment2 (#1706)

## Description

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Fixes #123
Fixes #456
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Taking ownership of authorization policy-assignment pattern module
## Pipeline Reference

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## Type of Change

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- [ ] Update to CI Environment or utlities (Non-module effecting
changes)
- [ ] Azure Verified Module updates:
- [ ] Bugfix containing backwards compatible bug fixes, and I have NOT
bumped the MAJOR or MINOR version in `version.json`:
- [ ] Someone has opened a bug report issue, and I have included "Closes
#{bug_report_issue_number}" in the PR description.
- [ ] The bug was found by the module author, and no one has opened an
issue to report it yet.
- [ ] Feature update backwards compatible feature updates, and I have
bumped the MINOR version in `version.json`.
- [ ] Breaking changes and I have bumped the MAJOR version in
`version.json`.
  - [ X] Update to documentation

## Checklist

- [ X] I'm sure there are no other open Pull Requests for the same
update/change
- [ X] I have run `Set-AVMModule` locally to generate the supporting
module files.
- [ X] My corresponding pipelines / checks run clean and green without
any errors or warnings

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---------

Co-authored-by: Erika Gressi <56914614+eriqua@users.noreply.github.com>

avm/ptn/authorization/role-assignment/README.md

@@ -1,10 +1,5 @@
 # Role Assignments (All scopes) `[Microsoft.Authorization/roleAssignments]`
 
-> ⚠️THIS MODULE IS CURRENTLY ORPHANED.⚠️
-> 
-> - Only security and bug fixes are being handled by the AVM core team at present.
-> - If interested in becoming the module owner of this orphaned module (must be Microsoft FTE), please look for the related "orphaned module" GitHub issue [here](https://aka.ms/AVM/OrphanedModules)!
-
 This module deploys a Role Assignment at a Management Group, Subscription or Resource Group scope.
 
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