[Storage] Add user agent for dataplane cmdlets

[blueww]

Description

There are no interface change, just to add Powershell user agent for some dataplane cmdlet.
We lost the user agent when Azure Powershell change framework from .net to netstandard, since the before global user agent setting API only works on .net.

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

[VeryEarly]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).