feat: Add CMake FetchContent support to updater (#104) #283

Job	Run time
cli-integration (macos)	4m 19s
updater-test-args / cancel-previous-run	4s
updater-create-pr / validate-inputs	11s
cli-integration (windows)	34s
cli-integration (ubuntu)	16s
updater-create-pr / cancel-previous-run	5s
updater-test-args / validate-inputs	6s
updater-test-args / update	10s
updater-create-pr / update	28s
updater-test-outputs	3s
	6m 16s

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