Bazel fetches the rules_python repository from somewhere without having a definition of this repository in the project

### Description of the bug:

rules_python doesn't have any kind of definition in my project, like http_archive or git_repository definitions, but bazel still fetches it from somewhere.

It looks like the rules_python repository definition is leaked from the bazel build itself, because it is defined in bazel's sourcecode.

In fact, defining rules_python like this doesn't make a difference:
```
http_archive(
name = "rules_python",
sha256 = "c68bdc4fbec25de5b5493b8819cfc877c4ea299c0dcb15c244c5a00208cde311",
strip_prefix = "rules_python-0.31.0",
url = "https://github.com/bazelbuild/rules_python/releases/download/0.31.0/rules_python-0.31.0.tar.gz",
)
```

bazel still uses the same version of rules_python that it uses without such repository definition.

### Which category does this issue belong to?

_No response_

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

_No response_

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

_No response_

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

_No response_

### 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 HEAD` ?

```text

```

### If this is a regression, please try to identify the Bazel commit where the bug was introduced with bazelisk --bisect.

_No response_

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

_No response_

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

_No response_

The report names no source files, tests, or reproducible command. First obtain a minimal Bazel workspace, the exact fetch output, Bazel release, operating system, and repository commit; then trace which Bazel-built definition supplies rules_python. Done means reproducing the unexpected fetch and identifying a concrete regression or correction.

Written by the indexing model from the issue text.