migrating to sdk/resourcemanager/**/arm** from services/**/mgmt/**

[mmorel-35]

Please add a summary of your change

migrating to sdk/resourcemanager/**/arm** from services/**/mgmt/**

Following https://github.com/Azure/azure-sdk-for-go/blob/main/documentation/MIGRATION_GUIDE.md

Does your change fix a particular issue?

No

Please indicate you've done the following:

• Accepted the DCO. Commits without the DCO will delay acceptance.
• Created a changelog file or added /kind changelog-not-required as a comment on this pull request.
• Updated the corresponding documentation in site/content/docs/main.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.88%. Comparing base (3d6dab0) to head (704e587).
Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7596      +/-   ##
==========================================
+ Coverage   61.84%   61.88%   +0.04%     
==========================================
  Files         265      266       +1     
  Lines       29356    29456     +100     
==========================================
+ Hits        18155    18230      +75     
- Misses       9913     9934      +21     
- Partials     1288     1292       +4     

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