Unable to get bazel 7 py_proto_library example working outside of rules_python dir

[Ryang20718]

🐞 bug report

Affected Rule

Bazel 7.1.2 + rules_python 0.32.2 seems to be unable to import python proto libraries

Description

I've created a minimal repro here https://github.com/Ryang20718/bazel_rules_python_proto/tree/main

git clone https://github.com/Ryang20718/bazel_rules_python_proto.git
cd bazel_rules_python_proto
USE_BAZEL_VERSION=7.1.2 bazelisk test //foxglove:all --noenable_bzlmod --announce_rc -s --sandbox_debug

will result in failures. however, the same exact directory structure inside the example folder of rules_python will succeed

git clone https://github.com/Ryang20718/bazel_rules_python_proto.git
cd bazel_rules_python_proto/rules_python_working/examples/py_proto_library
USE_BAZEL_VERSION=7.1.2 bazelisk test //foxglove:all --noenable_bzlmod --announce_rc -s --sandbox_debug

I've been staring at differences for days, but I'm unsure of what could possibly be the difference?

🌍 Your Environment

Operating System:

ubuntu 20.04

Output of bazel version:
7.1.2
Rules_python version:

0.32.2

[aignas]

Given #1933 and the proto rules moving out of the rules_python repo, I think the best course of action would be to look at the new home. And see how to get the new version of the py proto rule warking.