[clang-tools-extra] [clang-doc] Precommit end-to-end test for `--repository` option (PR #122565)

[Paul Kirth via cfe-commits]

ilovepi wrote:

### Merge activity

* **Feb 6, 1:58 PM EST**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/122565).


https://github.com/llvm/llvm-project/pull/122565