MDCMigration: Style alert snackbar for MDC migration. #10910

Job	Run time
lint-misc	12s
lint-frontend	1m 41s
lint-python-flake8 (3.9)	22s
build-data-server-pip (native, ubuntu-22.04, 1.65.0)	2m 2s
lint-python-flake8 (3.10)	19s
lint-python-yaml-docs	31s
build-data-server-pip (native, macos-12, 1.65.0)	3m 12s
lint-python-flake8 (3.11)	17s
lint-rust (1.65.0, 0.16.1)	49s
build-data-server-pip (universal, ubuntu-22.04, 1.65.0)	19s
build (tf, 3.9)	1h 2m 8s
build (notf, 3.9)	1h 0m 41s
	2h 12m 33s

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