Why are there '-Clean' and '-Restart' switches for 'Publish-AzWebApp'?

### Description

I think this question is related to the issue #24234.

According to [Microsoft Learn](https://learn.microsoft.com/en-us/azure/azure-functions/deployment-zip-push), when we use zip deployment, `any files from an existing deployment that aren't found in the .zip file are deleted from your function app.`, and zip deployment `restarts the app`.

If so, why are there '-Clean' and '-Restart' switches for 'Publish-AzWebApp'?

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Start with the Publish-AzWebApp cmdlet documentation and the linked issue #24234, then compare the documented behavior of its -Clean and -Restart switches with Azure zip deployment. Done means explaining whether the switches add behavior beyond zip deployment and updating the relevant documentation or guidance if the distinction is missing.

Written by the indexing model from the issue text.