Load and merge all public cloud environments

[dingmeng-xue]

Description

Fix #12633
Load and merge all public environments even environment is loaded from ARM endpoint
Safe check AzureCloud existing in Connect-AzAccount

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)
  • the markdown help files have been regenerated using the commands listed here

[adxsdkps]

Can one of the admins verify this patch?

[dingmeng-xue]

/azp run azure-powershell - powershell-core

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[dingmeng-xue]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[msJinLei]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).