SF-3757 Add simplified draft config page as experimental feature

[Nateowami]

This PR creates a new, simplified page for configuring draft sources.

I initially made changes to the draft sources component, moving the content from the left, while keeping the layout of the overview on the right. See diagram below:

During a recent meeting we discussed the best way to get user feedback before rolling this out. It was decided to create a new "Experimental features" system that allows users to turn it on, so that it can be tested with real users and real projects before we roll it out.

I created an experimental features service and dialog that merely exposes certain feature flags through a different UI to allow users to turn them on or off. When no experimental features are available, it's not available in the menu. Some features (such as the new configure sources page) are only available to users that are an admin on at least one project.

Mostly I deleted a lot of code, especially in the template and styles, plus a few things in the component TS file that were no longer used by the template. Unfortunately, copying the component makes it a lot harder for a reviewer to tell what was changed.

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This change is 

[codecov]

Codecov Report

❌ Patch coverage is 73.00000% with 54 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.31%. Comparing base (a5da91d) to head (e0e3d80).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...nfigure-sources/new-configure-sources.component.ts	70.93%	37 Missing and 13 partials ⚠️
...ate/draft-generation/draft-generation.component.ts	50.00%	1 Missing and 1 partial ⚠️
...Forge.Scripture/ClientApp/src/app/app.component.ts	50.00%	1 Missing ⚠️
...ientApp/src/xforge-common/user-projects.service.ts	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3763      +/-   ##
==========================================
+ Coverage   81.29%   81.31%   +0.02%     
==========================================
  Files         621      624       +3     
  Lines       39114    39308     +194     
  Branches     6382     6415      +33     
==========================================
+ Hits        31798    31965     +167     
- Misses       6331     6344      +13     
- Partials      985      999      +14     

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