Remove python_version & srcs_version from build files (#7122) #12063

Job	Run time
lint-python-yaml-docs	26s
build-data-server-pip (native, ubuntu-22.04, 1.65.0)	1m 26s
lint-misc	13s
lint-frontend	1m 46s
lint-python-flake8 (3.9)	21s
lint-python-flake8 (3.10)	17s
build-data-server-pip (universal, ubuntu-22.04, 1.65.0)	15s
lint-python-flake8 (3.11)	49s
lint-rust (1.65.0, 0.16.1)	27s
build (tf, 3.10)	50m 7s
build (notf, 3.10)	46m 43s
	1h 42m 50s

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