https://cs.bazel.build search results redirect to GitHub

### Description of the bug:

Code search results on https://cs.bazel.build used to link to a Google Code Search view with clickable references, git blame etc. Now, they just redirect to GitHub Code Search.

### What's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

1. Go to https://cs.bazel.build
2. Search for `Label.java`.
3. Click on the BUILD file result.
4. Observe that you are taken to GitHub, with apparently no way of opening the regular Google Code Search view.

### Which operating system are you running Bazel on?

n/a

### What is the output of `bazel info release`?

n/a

### If `bazel info release` returns `development version` or `(@non-git)`, tell us how you built Bazel.

_No response_

### What's the output of `git remote get-url origin; git rev-parse master; git rev-parse HEAD` ?

_No response_

### Is this a regression? If yes, please try to identify the Bazel commit where the bug was introduced.

Yes, this worked until at least 2023-07-11.

### Have you found anything relevant by searching the web?

_No response_

### Any other information, logs, or outputs that you want to share?

_No response_

Start at https://cs.bazel.build and reproduce the Label.java search, then click the BUILD file result to confirm the redirect to GitHub Code Search. Investigate the service or configuration responsible for that result link; done means results open the regular Google Code Search view with clickable references and git blame as described.

Written by the indexing model from the issue text.