Upgrade RNX to target RN and RNW 0.72 #60

Job	Run time
Setup Check	2m 58s
Build NPM Package / Build NPM Package	2m 31s
Run CodeGen / Run CodeGen	7m 24s
Build Example (example) / Build example	26m 58s
Build Example (examplenuget) / Build examplenuget	11m 17s
Build RNX (Release, x64) / Build RNX Release x64	27m 15s
Test CLI (0.71-stable, false) / New RNW@0.71-stable App from Source	14m 16s
Test CLI (0.71-stable, true) / New RNW@0.71-stable App from NuGet	13m 44s
Test CLI (latest, false) / New RNW@latest App from Source	13m 54s
Test CLI (latest, true) / New RNW@latest App from NuGet	13m 43s
Test CLI (Old) (0.67-stable, false) / New RNW@0.67-stable App from Source	11m 10s
Test CLI (Old) (0.67-stable, true) / New RNW@0.67-stable App from NuGet	10m 42s
Test CLI (Old) (0.69-stable, false) / New RNW@0.69-stable App from Source	10m 46s
Test CLI (Old) (0.69-stable, true) / New RNW@0.69-stable App from NuGet	10m 39s
Successful PR Check	0s
	2h 57m 17s

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