[`refurb`] Implement `isinstance-type-none` (`FURB168`) #20924

Job	Run time
Determine changes	10s
cargo test (linux)	5m 33s
cargo clippy	2m 16s
cargo fuzz	5m 34s
cargo test (wasm)	1m 33s
cargo fmt	18s
test scripts	1m 13s
benchmarks	13m 56s
cargo test (windows)	6m 44s
cargo udeps	2m 45s
mkdocs	1m 51s
pre-commit	1m 36s
python package	1m 47s
Formatter ecosystem and progress checks	0s
test ruff-lsp	25s
ecosystem	5m 53s
	51m 34s

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