Generated solution includes markdown documents for disabled components

### Describe the bug

The generated solution doesn't exclude markdown documents for disabled components, making it impossible to use the 'single-component' view through our primary solution.

### Steps to reproduce

```
.\tooling\GenerateAllSolution.ps1 -MultiTargets wasdk -Components Extensions
```

Note: due to another bug, the Converters and SettingsControls must be included when building the gallery, making the repro command:
```
.\tooling\GenerateAllSolution.ps1 -MultiTargets wasdk -Components Extensions,Converters,SettingsControls
```

### Expected behavior

When single-solution (tabbed) view should show if only a single component is requested during solution generation, and documents in excluded components shouldn't be included.

### Screenshots

Note how the sample projects are not included, but the markdown files containing the samples appear anyway.


### Code Platform

- [ ] UWP
- [ ] WinAppSDK / WinUI 3
- [ ] Web Assembly (WASM)
- [ ] Android
- [ ] iOS
- [ ] MacOS
- [ ] Linux / GTK

### Windows Build Number

- [ ] Windows 10 1809 (Build 17763)
- [ ] Windows 10 1903 (Build 18362)
- [ ] Windows 10 1909 (Build 18363)
- [ ] Windows 10 2004 (Build 19041)
- [ ] Windows 10 20H2 (Build 19042)
- [ ] Windows 10 21H1 (Build 19043)
- [ ] Windows 11 21H2 (Build 22000)
- [ ] Other (specify)

### Other Windows Build number

_No response_

### App minimum and target SDK version

- [ ] Windows 10, version 1809 (Build 17763)
- [ ] Windows 10, version 1903 (Build 18362)
- [ ] Windows 10, version 1909 (Build 18363)
- [ ] Windows 10, version 2004 (Build 19041)
- [ ] Other (specify)

### Other SDK version

_No response_

### Visual Studio Version

_No response_

### Visual Studio Build Number

_No response_

### Device form factor

_No response_

### Additional context

_No response_

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