Memoizes the functions for getting header both runs and scalar data t… #11509

Job	Run time
lint-frontend	1m 27s
lint-python-flake8 (3.9)	19s
build-data-server-pip (native, ubuntu-20.04, 1.65.0)	1m 16s
lint-python-flake8 (3.10)	26s
lint-misc	17s
build-data-server-pip (native, macos-12, 1.65.0)	1m 39s
lint-python-flake8 (3.11)	13s
build-data-server-pip (universal, ubuntu-20.04, 1.65.0)	15s
lint-python-yaml-docs	26s
lint-rust (1.65.0, 0.16.1)	38s
build (tf, 3.9)	13m 20s
build (notf, 3.9)	9m 16s
	29m 32s

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