Add Microsoft.PowerShell.PlatyPS module

### Problem description

With the preview release of `Microsoft.PowerShell.PlatyPS`, it would be great to include it in the `RequiredModules.psd1` and move the task logic to use the new commands.

### Verbose logs

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### How to reproduce

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### Expected behavior

Use `Microsoft.PowerShell.PlatyPS`.

### Current behavior

Uses `PlatyPS`

### Suggested solution

Change the `RequiredModules.psd1` to include the module. Update the relevant doc tasks.

### Operating system the target node is running

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### PowerShell version and build the target node is running

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### Module version used

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Start with RequiredModules.psd1 and locate the relevant documentation tasks that currently use PlatyPS. Check how those tasks invoke the existing commands, then update the module requirement and task logic to use Microsoft.PowerShell.PlatyPS. Done means the documentation tasks run successfully with the new module.

Written by the indexing model from the issue text.