[red-knot] Shorten the paths for some mdtest files (#14267) #35445

Job	Run time
Determine changes	12s
cargo fmt	17s
pre-commit	1m 9s
mkdocs	2m 48s
python package	1m 22s
cargo clippy	1m 47s
cargo test (wasm)	1m 39s
cargo test (linux)	4m 26s
cargo build (release)	5m 1s
cargo test (windows)	7m 7s
cargo fuzz	4m 45s
cargo build (msrv)	3m 48s
cargo shear	23s
formatter instabilities and black similarity	4m 8s
test scripts	1m 12s
benchmarks	4m 43s
test ruff-lsp	33s
ecosystem	0s
Fuzz the parser	0s
	45m 20s

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