modifying Backup Time header to display UTC

[hiaga]

Description

modify Get-AzRecoveryServicesBackupProtectionPolicy table output to specifiy Backup time is in UTC

Checklist

• [Yes] I have read the Submitting Changes section of CONTRIBUTING.md
• [Yes] The title of the PR is clear and informative
• [Yes] 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
• [Yes] The PR does not introduce breaking changes
• [Yes] If applicable, the changes made in the PR have proper test coverage
• [N/A] For public API changes to cmdlets:
  • [N/A] a cmdlet design review was approved for the changes in this repository (Microsoft internal only)
  • [N/A] the markdown help files have been regenerated using the commands listed here

[isra-fel]

Hi @hiaga what's the status of this PR?
Are you going to add more or you'd just like to update the table lables?

[hiaga]

Hi @isra-fel please do not merge this PR yet, changes aren't working. I just want to update the table labels.

[isra-fel]

OK. Let me know when it's ready please

[hiaga]

@isra-fel Please go ahead with this PR. Regards.