test

Remove unused FileWatch header (#541) #3825

Job	Run time
reusable_tests / tsan	4m 32s
reusable_tests / python-linter	13s
reusable_tests / asan	4m 10s
reusable_tests / coverage	4m 36s
reusable_tests / flaky	3m 26s
reusable_tests / uncrustify	38s
reusable_docker_tests / docker-test	24m 10s
reusable_tests / ubuntu-24.04-ci / ubuntu-24.04-ci-Release	3m 38s
reusable_tests / ubuntu-24.04-ci / ubuntu-24.04-ci-Debug	3m 25s
reusable_tests / docs	1m 7s
reusable_tests / ubuntu-22.04-ci / ubuntu-22.04-ci-Release	3m 57s
reusable_tests / windows-2022-ci / windows-2022-ci-Debug	6m 57s
reusable_tests / ubuntu-22.04-ci / ubuntu-22.04-ci-Debug	4m 11s
reusable_tests / windows-2022-ci / windows-2022-ci-Release	7m 17s
reusable_tests / clang	2m 12s
	1h 14m 29s

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