CI doesn't build instrumented test sources

[alexvanyo]

snippets/.github/workflows/build.yml

Lines 40 to 51 in 1b043a4

	- name: Build Compose
	run: ./gradlew :compose:snippets:build
	- name: Build recompose snippets
	run: ./gradlew :compose:recomposehighlighter:build
	- name: Build kotlin snippets
	run: ./gradlew :kotlin:build
	- name: Build Wear snippets
	run: ./gradlew :wear:build
	- name: Build misc snippets
	run: ./gradlew :misc:build
	- name: Build XR snippets
	run: ./gradlew :xr:build

The CI workflow runs build on the various subprojects, but this doesn't build the sources for instrumented tests underneath androidTest. This means that all of those snippets aren't being validated for compilation (and indeed they don't compile right now as of writing this issue: #575 )