Add automatic check of .vsconfig file entries

### Microsoft PowerToys version

0.00.0

### Installation method

Other (please specify in "Steps to Reproduce")

### Area(s) with issue?

General

### Steps to reproduce

When running `setup-dev-environment.ps1`, the following .vsconfig entries are currently unavailable.

```
"Microsoft.VisualStudio.Component.Windows10SDK.19041",
"Microsoft.VisualStudio.Component.Windows10SDK.20348",
"Microsoft.VisualStudio.Component.Windows10SDK.22621",
"Microsoft.VisualStudio.Component.Windows10SDK.26100",
"Microsoft.VisualStudio.ComponentGroup.WindowsAppSDK.Cs"
```

### ✔️ Expected Behavior

All entries in .vsconfig file are available.

### ❌ Actual Behavior

VS installer indicates that the specified files are unavailable.

### Upload Bug Report ZIP-file

_No response_

### Additional Information

Entries in .vsconfig will regularly come and go, so it seems natural to have automatic checks and remediation to avoid periodic issues.

### Other Software

_No response_

Start by reading and running setup-dev-environment.ps1 alongside the repository’s .vsconfig entries. Determine how unavailable entries should be detected and remediated as Visual Studio components change. Done means the setup process checks the listed entries and handles unavailable components without leaving the configuration unusable.

Written by the indexing model from the issue text.