Improve the file watching failure error message #39492

Job	Run time
cargo fmt	18s
cargo build (release)	0s
Determine changes	9s
mkdocs	2m 33s
pre-commit	3m 28s
python package	1m 19s
cargo test (wasm)	1m 37s
cargo build (msrv)	4m 17s
cargo clippy	1m 47s
cargo test (windows)	4m 57s
cargo test (linux, release)	4m 2s
benchmarks	5m 0s
cargo fuzz build	5m 29s
cargo shear	28s
cargo test (linux)	1m 49s
test scripts	1m 6s
formatter instabilities and black similarity	0s
ecosystem	21s
test ruff-lsp	43s
fuzz parser	0s
	39m 23s

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