ApiManagement - new verison 2020-12-01 update

[KacieKK]

Description

update to latest SDK

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate ChangeLog.md file(s) has been updated:
  • For any service, the ChangeLog.md file can be found at src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md
  • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header -- no new version header should be added
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • a cmdlet design review was approved for the changes in this repository (Microsoft internal only)
    • https://github.com/Azure/azure-powershell-cmdlet-review-pr/issues/971
    • https://github.com/Azure/azure-powershell-cmdlet-review-pr/issues/968
    • https://github.com/Azure/azure-powershell-cmdlet-review-pr/issues/974
  • the markdown help files have been regenerated using the commands listed here

[isra-fel]

As the log of CI suggests, please fix 2 issues in help documents

Target      : New-AzApiManagementKeyVaultObject.md
  Description : Online version in the header of the file is incorrect. The 
                corresponding URL should be the following: https://docs.microsoft
                .com/powershell/module/az.apimanagement/new-azapimanagementkeyvau
                ltobject
  
  Target      : Sync-AzApiManagementKeyVaultSecret.md
  Description : Online version in the header of the file is incorrect. The 
                corresponding URL should be the following: https://docs.microsoft
                .com/powershell/module/az.apimanagement/sync-azapimanagementkeyva
                ultsecret

[isra-fel]

Besides, some scenario tests are failing

[solankisamir]

/azp run

[azure-pipelines]

Commenter does not have sufficient privileges for PR 15524 in repo Azure/azure-powershell

[KacieKK]

@isra-fel Please take a look again

[solankisamir]

@isra-fel can you please take a look at this?

fixed