[Az.WebSites] Remove parsing for SnapshotTime

[vkarasala]

Description

The changes are to remove DateTime conversion for SnapshotTime. The conversion trims the UTC time and sends incorrect date to backend.

Checklist

• Check this box to confirm: I have read the Submitting Changes section of CONTRIBUTING.md and reviewed the following information:

• SHOULD select appropriate branch. Cmdlets from Autorest.PowerShell should go to generation branch.
• SHOULD make the title of PR clear and informative, and in the present imperative tense.
• SHOULD update ChangeLog.md file(s) appropriately
  • 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 in the past tense. Add changelog in description section if PR goes into generation branch.
  • Should not change ChangeLog.md if no new release is required, such as fixing test case only.
• SHOULD have approved design review for the changes in this repository (Microsoft internal only) with following situations
  • Create new module from scratch
  • Create new resource types which are not easy to conform to Azure PowerShell Design Guidelines
  • Create new resource type which name doesn't use module name as prefix
  • Have design question before implementation
• SHOULD regenerate markdown help files if there is cmdlet API change. Instruction
• SHOULD have proper test coverage for changes in pull request.
• SHOULD NOT introduce breaking changes in Az minor release except preview version.
• SHOULD NOT adjust version of module manually in pull request

[azure-client-tools-bot-prd]

️✔️Az.Accounts

️✔️Build

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️✔️Az.Compute

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️✔️Az.ManagedServiceIdentity

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️✔️Az.OperationalInsights

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️✔️Az.PrivateDns

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️✔️Az.Sql

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️✔️Az.Storage

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️✔️Windows PowerShell - Windows

️✔️Az.Websites

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️✔️PowerShell Core - Windows

️✔️Windows PowerShell - Windows

️✔️Breaking Change Check

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️✔️Test

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️✔️Windows PowerShell - Windows

[github-actions]

To the author of the pull request,
This PR was labeled "Breaking Change Release" because it contains breaking changes.
According to our policy, breaking changes can only take place during major release and they must be preannounced.
Please follow our guide on the detailed steps.

[vkarasala]

@VeryEarly Kindly review.
Thanks,
Ashok.

[VeryEarly]

please regenerate help markdown for those cmdlets with syntax changes:
https://github.com/Azure/azure-powershell/blob/main/documentation/development-docs/help-generation.md

[github-actions]

This PR was labeled "needs-revision" because it has unresolved review comments or CI failures.
Please resolve all open review comments and make sure all CI checks are green. Refer to our guide to troubleshoot common CI failures.

[YanaXu]

@vkarasala, I closed this PR since it's not updated for months. Feel free to reopen it or create a new one when it's ready. Thanks.