Add an alert to the create feed wizard to inform the user about selecting a data source

[PintoGideon]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (6473ff2) 74.91% compared to head (5090052) 23.19%.
Report is 49 commits behind head on master.

Files	Patch %	Lines
src/components/CreateFeed/ChooseConfig.tsx	33.33%	4 Missing and 4 partials ⚠️
src/components/CreateFeed/CreateFeed.tsx	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1052       +/-   ##
===========================================
- Coverage   74.91%   23.19%   -51.73%     
===========================================
  Files         172      184       +12     
  Lines       53511     6075    -47436     
  Branches      706     1308      +602     
===========================================
- Hits        40088     1409    -38679     
+ Misses      12719     4570     -8149     
+ Partials      704       96      -608     

Flag	Coverage Δ
e2etests	23.19% <47.05%> (-51.73%)	⬇️

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