Add flag to control LegacyBindingGraphFactory usage. #5056

Job	Run time
Validate Dagger version	15s
Gradle build	38s
Bazel build	4m 48s
Bazel tests	16m 40s
Test Hilt Gradle plugin	8m 13s
Artifact verification tests	11m 29s
Artifact Android local tests (AGP 8.1.1)	9m 39s
Artifact Java local tests	3m 40s
Artifact Android emulator tests (API ${{ matrix.api-level }})	0s
Build Hilt Gradle plugin against latest AGP version	0s
Clean up GitHub Action caches	5s
Publish snapshot	0s
	55m 27s

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