Rename `red_knot_workspace` to `red_knot_project` #39183

Job	Run time
cargo fmt	18s
Determine changes	12s
cargo build (release)	0s
mkdocs	2m 56s
pre-commit	4m 21s
python package	1m 34s
cargo clippy	2m 16s
cargo build (msrv)	4m 3s
cargo fuzz build	5m 0s
benchmarks	5m 17s
cargo shear	21s
cargo test (linux)	1m 21s
cargo test (linux, release)	3m 25s
cargo test (wasm)	1m 58s
cargo test (windows)	3m 57s
formatter instabilities and black similarity	3m 30s
test scripts	1m 6s
ecosystem	0s
fuzz parser	0s
test ruff-lsp	0s
	41m 35s

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