Rollup merge of #117524 - unleashed:bootstrap-create-hooks-dir, r=Mark-Simulacrum

bootstrap/setup: create hooks directory if non-existing

When running `./x setup` on a local repository I chose to install a `pre-push` git hook, but this happened:

```shell
Would you like to install the git hook?: [y/N] y
error: could not create hook .git/hooks/pre-push: do you already have the git hook installed?
No such file or directory (os error 2)
thread 'main' panicked at src/core/build_steps/setup.rs:462:9:
install_git_hook_maybe(&config) failed with No such file or directory (os error 2)
```

This was caused because the `.git/hooks` directory did not exist in my local repository. Creating it manually and re-running the command works fine.

This PR tests for the above directory and if it does not exist then it _tries_ to create it before hard linking the pre-push hook - we use `fs::create_dir()` and disregard the result (ie. it could fail if the directory was created in the meantime) and proceed to call `fs::hard_link()` all the same.

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