Unattended install: Added the ability to set the telemetry level

[KaasKop97]

What did I do

I added 'UnattendedTelemetryLevel' to the unattended installer configuration, I used the already existing unattended installer notification handler and renamed it to a better suiting more generic name so I could include the setting of telemetry level.
Also fixed some formatting and comments in the files I edited.

Why did I do it

I noticed I could set the telemetry level from the regular installer but not from an unattended installation.
I already applied a patch akin to this one in my own Umbraco project but I thought other people might also want the functionality to set the telemetry level from an unattended install hence this pull request.

How to test

Add the already present unattended installation settings and add a property in the map with "UnattendedTelemetryLevel" to either "Minimal", "Basic" or "Detailed" like so:

"Umbraco": {
    "CMS": {
      "Unattended": {
        "InstallUnattended": true,
        "UnattendedUserEmail": "[email protected]",
        "UnattendedUserName": "tester",
        "UnattendedUserPassword": "yesverisecure123!",
        "UnattendedTelemetryLevel": "Basic"
      },
    }
  }

The unattended installer will now run and set the telemetry level to the value provided in the appsettings. If the level is not set in the appsettings it falls back to 'Detailed' like the regular installer.

If the pull request is merged I shall also update the documentation to match the functionality.

[github-actions]

Hi there @KaasKop97, thank you for this contribution! 👍

While we wait for one of the Core Collaborators team to have a look at your work, we wanted to let you know about that we have a checklist for some of the things we will consider during review:

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[AndyButland]

Thanks for this @KaasKop97 - looks a useful addition.

I had a quick look over and spotted a couple of issues. If you are able to resolve these we should have time next week for a full review and test and consider merging this in.

[AndyButland]

Looks good and works nicely @KaasKop97 - thanks very much. I'll merge this in for Umbraco 17 and prepare a documentation update for the new option.

First though just going to prepare an update to add this to the dotnet new template as well, to align with the other unattended options.

[AndyButland]

Have verified the template options creating a project both with the CLI and Visual Studio.

Docs PR for this update is here: umbraco/UmbracoDocs#7450