Add Smoke Test on Powershell 7.1.0 (Latest Version)

[BethanyZhou]

Description

Improve azure-powershell - smoke-test from 3 perspectives:

• Move key steps of smoke test to smoke-test-steps.yml as a template

• Allow to update dotnet core version to get the latest powershell

• Allow to do not specify the version of powershell. In this way, pipeline always gets the latest one to test.

Below is a successful run instance:
https://dev.azure.com/azure-sdk/internal/_build/results?buildId=618357&view=results

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)
    • {Please put the link here}
  • the markdown help files have been regenerated using the commands listed here

[BethanyZhou]

/azp run azure-powershell - windows-powershell

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[BethanyZhou]

/azp run azure-powershell - windows-powershell

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).