Remove git Theia extension from examples #5792

Job	Run time
Lint	5m 49s
Lint	5m 49s
Build and Test (windows-2019, node-16.x)	14m 35s
Build and Test (windows-2019, node-16.x)	14m 35s
Build and Test (windows-2019, node-18.x)	13m 17s
Build and Test (windows-2019, node-18.x)	13m 17s
Build and Test (windows-2019, node-20.x)	15m 7s
Build and Test (windows-2019, node-20.x)	15m 7s
Build and Test (ubuntu-latest, node-16.x)	10m 46s
Build and Test (ubuntu-latest, node-16.x)	10m 46s
Build and Test (ubuntu-latest, node-18.x)	10m 44s
Build and Test (ubuntu-latest, node-18.x)	10m 44s
Build and Test (ubuntu-latest, node-20.x)	11m 26s
Build and Test (ubuntu-latest, node-20.x)	11m 26s
Build and Test (macos-11, node-16.x)	1m 15s
Build and Test (macos-11, node-16.x)	14m 26s
Build and Test (macos-11, node-18.x)	13m 59s
Build and Test (macos-11, node-18.x)	13m 59s
Build and Test (macos-11, node-20.x)	15m 45s
Build and Test (macos-11, node-20.x)	15m 45s
	3h 58m 37s

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