Cannot use `runfiles.python` import path when running `bazel coverage`

# 🐞 bug report

### Affected Rule

compile_pip_requirements

### Is this a regression?

Not sure.

### Description

In some situations it is possible to get a conflict between the python module from the coverage package and the python package from the runfiles library. I would say this is due to the slightly risky use of "python" as a module/package name and the import `from python.runfiles import runfiles` in dependency_resolver.py.

## 🔬 Minimal Reproduction

```
cd examples/multi_python_versions
bazel coverage --incompatible_default_to_explicit_init_py //requirements:requirements_3_10_test
```

## 🔥 Exception or Error

```
michaelboyd multi_python_versions $ bazel coverage --incompatible_default_to_explicit_init_py //requirements:requirements_3_10_test
INFO: Using default value for --instrumentation_filter: "^//requirements[/:]".
INFO: Override the above default with --instrumentation_filter
INFO: Analyzed target //requirements:requirements_3_10_test (0 packages loaded, 0 targets configured).
FAIL: //requirements:requirements_3_10_test (see /private/var/tmp/_bazel_michaelboyd/52019027f6106b6e52388536c05b77eb/execroot/_main/bazel-out/darwin_arm64-fastbuild-ST-eaf12dacd369/testlogs/requirements/requirements_3_10_test/test.log)
INFO: From Testing //requirements:requirements_3_10_test:
==================== Test output for //requirements:requirements_3_10_test:
Traceback (most recent call last):
File "/private/var/tmp/_bazel_michaelboyd/52019027f6106b6e52388536c05b77eb/execroot/_main/bazel-out/darwin_arm64-fastbuild-ST-eaf12dacd369/bin/requirements/requirements_3_10_test.runfiles/rules_python~/python/private/pypi/dependency_resolver/dependency_resolver.py", line 28, in
from python.runfiles import runfiles
ModuleNotFoundError: No module named 'python.runfiles'; 'python' is not a package
```

## 🌍 Your Environment

**Operating System:**

  

MacOS

  

**Output of `bazel version`:**

  

Bazelisk version: development

Build label: 7.2.0

Build target: @@//src/main/java/com/google/devtools/build/lib/bazel:BazelServer

Build time: Mon Jun 10 13:04:55 2024 (1718024695)

Build timestamp: 1718024695

Build timestamp as int: 1718024695  

**Rules_python version:**

  

Tested on main: ea49937782fb0b969c72625f3b397f4bab53d412

  

Start by running `bazel coverage --incompatible_default_to_explicit_init_py //requirements:requirements_3_10_test` from `examples/multi_python_versions`. Read `rules_python~/python/private/pypi/dependency_resolver/dependency_resolver.py`, especially the `from python.runfiles import runfiles` import, and inspect the reported test log. Done means the coverage command completes without the `python.runfiles` import error.

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