Make chef cloudbuild checkout submodules before building #80984

Job	Run time
Build framework (macos-release-availability, -sdk macosx -configuration Release WARNING_CFLAGS=...	13m 3s
Build framework (ios-release, -sdk iphoneos -configuration Release WARNING_CFLAGS='${inherited} -...	9m 52s
Build framework (ios-debug, -sdk iphoneos -configuration Debug WARNING_CFLAGS='${inherited} -We...	7m 27s
Build framework (tvos-debug, -sdk appletvos -configuration Debug WARNING_CFLAGS='${inherited} -W...	6m 58s
Build framework (watchos-debug, -sdk watchos -configuration Debug WARNING_CFLAGS='${inherited}...	12m 0s
Run framework tests (asan, -enableAddressSanitizer YES -enableUndefinedBehaviorSanitizer YES)	21m 6s
Build TV Casting Bridge example	15m 47s
Run framework tests (asan-global-storage, -enableAddressSanitizer YES -enableUndefinedBehaviorSan...	21m 44s
Run framework tests (tsan, -enableThreadSanitizer YES)	20m 7s
	2h 8m 4s

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