Fix CI pipelines and bump to RNW 0.73.21 #151

Job	Run time
Setup Check	2m 55s
Run CodeGen / Run CodeGen	4m 32s
Build NPM Package / Build NPM Package	4m 7s
Build Example (example) / Build example	4m 52s
Build Example (examplenuget) / Build examplenuget	4m 48s
Build RNX (Release, x64) / Build RNX Release x64	17m 3s
Test CLI (VS 2022) (0.72-stable, false) / New RNW@0.72-stable App from Source	4m 40s
Test CLI (VS 2022) (0.72-stable, true) / New RNW@0.72-stable App from NuGet	4m 34s
Test CLI (VS 2022) (0-73-stable, false) / New RNW@0-73-stable App from Source	4m 31s
Test CLI (VS 2022) (0-73-stable, true) / New RNW@0-73-stable App from NuGet	4m 41s
Successful PR Check	0s
	56m 43s

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