Hparams: Populate `differs` field for TF summary hparams. #10824

Job	Run time
lint-frontend	1m 40s
lint-python-flake8 (3.9)	21s
lint-misc	13s
lint-python-flake8 (3.10)	19s
build-data-server-pip (native, ubuntu-22.04, 1.65.0)	1m 51s
lint-python-flake8 (3.11)	20s
build-data-server-pip (native, macos-12, 1.65.0)	3m 37s
lint-python-yaml-docs	34s
lint-rust (1.65.0, 0.16.1)	52s
build-data-server-pip (universal, ubuntu-22.04, 1.65.0)	17s
build (tf, 3.9)	16m 14s
build (notf, 3.9)	10m 11s
	36m 29s

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