Change performance diagnostics to use Managed Identity

[lukeluong1212]

Add MSI support for performance diagnostics and remove SAS usage per Security Wave requirements.

Notes:

• This will still not work until the MSI support for Azure Performance Diagnostics is released. The work for that is still on-going.
• The VM will need to be preconfigured with these role assignments for Storage Account at Subscription level so it can inherit the permissions:
  - Storage Account Contributor
  - Storage Account Blob Contributor
  - Storage Account Table Contributor

[LiliDeng]

@lukeluong1212 please change the test priority back to 1 in

lisa/microsoft/testsuites/vm_extensions/azureperformancediagnostics.py

Line 63 in 08b810d

priority=5,

[LiliDeng]

@lukeluong1212 let know which package version need to be updated, thanks!

[lukeluong1212]

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