Full fix for installation issue when My Documents on network drive

[drawbyperpetual]

Summary of the Pull Request

Full fix for #32341 that works for both per-user and per-machine installs.

PR Checklist

PR Checklist

• [X ] Closes: Installation does not complete #32341
• [X ] Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: Added/updated and all pass
• Localization: All end user facing strings can be localized
• Dev docs: Added/updated
• New binaries: Added on the required places
  • JSON for signing for new binaries
  • WXS for installer for new binaries and localization folder
  • YML for CI pipeline for new test projects
  • YML for signed pipeline
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

• A new custom action unconditionally writes DSC assets onto [INSTALL FOLDER]\DSCModules.
• A new custom action is used to install DSC assets to the correct location in the case of a per-user install. These are copied from the [INSTALL FOLDER]\DSCModules location.
• A WiX-based install is performed (as before) in case of a per-machine install.

Validation Steps Performed

When My Documents is on a network drive (and also when this is not the case),

• Checked DSC assets correctly installed when installing PerUser / PerMachine.
• Checked DSC assets correctly installed when upgrading PerUser.
• Checked DSC assets correctly deleted when uninstalling PerUser / PerMachine. Note that occasionally, the containing folder (e.g. Microsoft.PowerToys.Configure\v0.0.1) is not correctly deleted when My Documents is on a network drive. I think this is because there is a latency-related issue with detecting that the folder is empty on the network drive shortly after having deleted files on it. Note that this issue never seems to occur when My Documents is on a regular drive; the containing folder always correctly gets deleted.

[drawbyperpetual]

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