[Storage] Fix Bug 10483492: Remove-AzDataLakeGen2Item fails with readonly sas

[blueww]

Description

This is to fix a bug that delete datalakegen2 items will first get item from server then delete it.
After the fix, will just delete the item without get it.

For move-AzDatalakeGen2Item, revise the existing check for dest.

This target 9/7 PSH release. We can merge it after 8/3 release is out.

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

[blueww]

Add "Do not merge" since need confirm a server behavior.
After it's confirmed, will remove the flag.