Avoid repeated triggers in nested `tryceratops` diagnostics #21854

Job	Run time
cargo fmt	15s
Determine changes	9s
cargo clippy	1m 41s
cargo fuzz	3m 27s
cargo test (wasm)	1m 6s
cargo test (linux)	3m 44s
cargo test (windows)	4m 29s
cargo udeps	2m 7s
pre-commit	32s
python package	1m 10s
test scripts	50s
benchmarks	9m 20s
mkdocs	2m 7s
formatter instabilities and black similarity	0s
test ruff-lsp	15s
ecosystem	7m 33s
	38m 45s

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