Controls: Added metadata to the Controls project to enable publishing to NuGet

[Lamparter]

Resolved / Related Issues

Discussed on Discord

Steps used to test these changes

1. Built the Files controls project
2. Checked for Roslyn analysers during build
3. Ensured NuGet package was correctly generated
4. Inspected NuGet package internals to ensure proper generation and inclusion of XAML resources

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WHEN PR IS ACCEPTED (NOT BEFORE)

• Implement actual secret
• Set environment to NuGet
• Remove build on main and PR configurations
• Add condition for run to only happen on changes made to CurrentVersion.props
• Replace default GitHub Actions runner token with files-community-bot[bot] token

[Lamparter]

Note for reviewer:

The CD fails because there is no such API key provided (please create a NUGET_API_KEY secret in the repository to enable publishing)

[0x5bfa]

We should do this after v4 or even later. What do you think?

[yaira2]

We can move forward with this as soon as the versioning system is agreed on.

[0x5bfa]

If you'd like to publish when you publish preview or stable thru Files CD, we can add a parameter text box to input the version. If empty, don't publish; otherwise, try publish with that version string.

[yaira2]

This shouldn't be tied to app releases. We may have a newer control ready for release before an app update, and on the other hand, we may want to release the app without updating the controls. It's best to handle this as a separate action.

[Lamparter]

@yaira2 when you approve you'll need to give the bot access to the repo
I think it's the read and write to pull request data permission

[0x5bfa]

Looks good, but I do belive we should not publish yet unless we ultimatelly remove WCT 7 controls (if we do, we should attribute properly) and fiinnsh unfinished controls such as Toolbar and Storage Bar/Ring.

[0x5bfa]

Suggested change

	PROPS_PATH: '${{ github.workspace }}\src\Files.App.Controls\CurrentVersion.props'
	VERSION_PROPS_PATH: '${{ github.workspace }}\src\Files.App.Controls\CurrentVersion.props'

[0x5bfa]

I dont think we need these comments

[0x5bfa]

Suggested change

	<!-- READ ME BEFORE MODIFYING THIS FILE:
	This file is used to track the version of the Files UI Controls package online.
	The version is automatically bumped by the 'Bump Files UI Controls' action online.
	You can bump the version here in a PR and when it is merged the controls project
	will be automatically published to NuGet online. -->
	<!--
	DO NOT MODIFY unless you are knowledgeable about this file:
	This file is used to track the version of the Files.App.Controls NuGet package online.
	The version is automatically bumped by a GitHub Action online.
	-->