Angular 21 upgrade #12132

Job	Run time
lint-python-yaml-docs	25s
lint-misc	14s
lint-rust (1.65.0, 0.16.1)	32s
build-data-server-pip (universal, ubuntu-22.04, 1.65.0)	21s
lint-frontend	1m 17s
lint-python-flake8 (3.10)	19s
lint-python-flake8 (3.9)	23s
lint-python-flake8 (3.11)	15s
build-data-server-pip (native, ubuntu-22.04, 1.65.0)	1m 32s
build (notf, 3.10)	42m 54s
build (tf, 3.10)	58m 0s
	1h 46m 12s

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