Include file permissions in key for cached files (#5901)

Reimplements #3104
Closes #5726

Note that we will generate the hash for a cache key twice in normal
operation. Once to check for the cached item and again to update the
cache. We could optimize this by generating the hash once in
`diagnostics::lint_file` and passing the `u64` into `get` and `update`.
We'd probably want to wrap it in a `CacheKeyHash` enum for type safety.

## Test plan

Unit tests for Windows and Unix.

Manual test with case from issue

```
❯ touch fake.py
❯ chmod +x fake.py
❯ ./target/debug/ruff --select EXE fake.py
fake.py:1:1: EXE002 The file is executable but no shebang is present
Found 1 error.
❯ chmod -x fake.py
❯ ./target/debug/ruff --select EXE fake.py
```

crates/ruff_cli/Cargo.toml

@@ -30,6 +30,7 @@ ruff_python_ast = { path = "../ruff_python_ast" }
 ruff_python_formatter = { path = "../ruff_python_formatter" }
 ruff_text_size = { workspace = true }
 ruff_textwrap = { path = "../ruff_textwrap" }
+ruff_macros = { path = "../ruff_macros" }
 
 annotate-snippets = { version = "0.9.1", features = ["color"] }
 anyhow = { workspace = true }

crates/ruff_cli/resources/test/fixtures/cache_mutable/source.py

@@ -1,4 +1,3 @@
-# NOTE: sync with cache::invalidation test
 a = 1
 
 __all__ = list(["a", "b"])