test: split test-fs-watch-ignore-* #2659

Job	Run time
Build slim tarball	1m 35s
aarch64-darwin: with shared libraries	2h 42m 52s
x86_64-darwin: with shared libraries	38m 58s
x86_64-linux: with shared libraries	30m 57s
aarch64-linux: with shared libraries	26m 3s
	4h 20m 25s

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