### Changes in this PR
* Refactor and remove some Core/C++ dependencies to simplify Python Observability package build process.
* Refactored code to read config at Python layer.
* Enable observability build from source.
* Add observability to run_test.
* Currently it's only enabled in Linux.
* Add error handler in run_test loaders.
* Current framework will always visit modules in test directory then decide which tests to skip.
* Since we're not building Observability for MacOS and Windows this step will fail with error `No module named 'grpc_observability'`.
* After the change we'll just skip those modules.
* We still have `_sanity_test` to make sure all tests are loaded correctly for each platform.
* Remov OC dependency as we're migrating to OTel.
* Also removed trace from testing.
* Note that trace propagation function was also removed because of this.
### Testing
* Passed existing tests.
* Tested locally, able to build observability from source using `GRPC_PYTHON_BUILD_WITH_CYTHON=1 pip install .`.
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Closes#34207
PiperOrigin-RevId: 590258014
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Closes#35255
COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/35255 from gnossen:freeze_googleapis_bazel 38fb05d8db
PiperOrigin-RevId: 588965912
Bumps [gevent](https://github.com/gevent/gevent) from 22.08.0 to 23.9.1.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="3977b6b3ec"><code>3977b6b</code></a>
Preparing release 23.9.1</li>
<li><a
href="068645423b"><code>0686454</code></a>
Typo.</li>
<li><a
href="bdc82c9e47"><code>bdc82c9</code></a>
Bump to greenlet 3.0rc3</li>
<li><a
href="ca0f9cb7b4"><code>ca0f9cb</code></a>
Bump to greenlet 3.0rc2 and require it on Py3.11 as well as 3.12. Also,
since...</li>
<li><a
href="0047199e04"><code>0047199</code></a>
Back to development: 23.9.0.post2</li>
<li><a
href="06879924ed"><code>0687992</code></a>
Preparing release 23.9.0.post1</li>
<li><a
href="166ecf1bc0"><code>166ecf1</code></a>
Fix windows wheel builds; ensure mac wheel builds have the universal2
tag</li>
<li><a
href="9b72b8c54e"><code>9b72b8c</code></a>
Back to development: 23.9.1</li>
<li><a
href="693181e8e1"><code>693181e</code></a>
Preparing release 23.9.0</li>
<li><a
href="6fc78989b6"><code>6fc7898</code></a>
Set the cython version; go back to default wheel tags.</li>
<li>Additional commits viewable in <a
href="https://github.com/gevent/gevent/compare/22.08.0...23.9.1">compare
view</a></li>
</ul>
</details>
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[requirements.bazel.txt] :updating wheel package to 0.38.1 to fix the
vulnerability
input: lang/python
release notes: no
settings: release notes:no
updating wheel package to 0.38.1 to fix the vulnerability
![image](https://github.com/grpc/grpc/assets/81183603/67212ab5-e67e-475a-938a-acc23ca4428b)
#python
please do fix it quickly
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We just found out that our current Bazel setup does not support Python
3.11.
Thus PR updates some dependencies to allow using Bazel in Python 3.11.
Cython:
* Cython [backported Python 3.11 support change to
0.29x](https://github.com/cython/cython/issues/4500), but it appears
that the Cython version we are using in Bazel does not include the fix,
so we're using the latest stable version instead.
Gevent:
* The first version of gevent that supports [Python 3.11 is
22.08.0](https://github.com/gevent/gevent/issues/1903#issuecomment-1303227507).
#### Testing
* Tested locally using Python 3.11 virtual environment, was able to
reproduce the issue and verified that those changes were able to fix it.
* WIP
* Add gevent test suite run under Bazel.
* Fix things up
* Yapf
* Fix up Bazel files
* Make py_grpc_test fancier
* Attempt to fix Windows RBE
* Attempt to kick GitHub
* Fix Python 2 runs
* Yet more fixes
* And the patch file too
* I am an idiot
* Mark gevent tests flaky
* Try to make rules_python more tolerant
* Typo
* Exclude reconnect test from gevent
* Remove unnecessary parts of patch
* Buildifier
* You saw nothing
* isort
* Move py_grpc_test to an internal-only file
* Review comments
* More reviewer comments
* Review
This commit resolves an interop test currently failing on master. Over
the past couple of weeks, bazel-based tests have been introduced. The
current setup does not appear to automatically handle transitive
dependencies. Instead, transitive dependencies such as `requests` have
been manually added to `requirements.bazel.txt`. It appears that the
build server happened to have the dependencies of the `requests` library
installed already, but later had a configuration wipe.
This was compounded by the google-auth library erroneously reporting
that the `requests` module itself was not installed. In fact, it was the
transitive dependencies of `requests` that were not being installed by
the build file. (third-order dependencies of our test)
I consider this a quick fix to get the build passing. In the long run,
we need to automatically resolve and install transitive dependencies in
our bazel builds.
Resolves: #17170
Add interop tests for gRPC Python. py_proto_library rules are added to
src/proto/grpc/testing/BUILD since grpc_proto_library is not compatible
with py_* rules.
'requests' python module is added to requirements.bazel.txt as it is a
dependency for google-auth. Previously, this was installed through
tools/run_tests/helper_scripts/build_python.sh before running tests.
Add interop tests for gRPC Python. py_proto_library rules are added to
src/proto/grpc/testing/BUILD since grpc_proto_library is not compatible
with py_* rules.
'requests' python module is added to requirements.bazel.txt as it is a
dependency for google-auth. Previously, this was installed through
tools/run_tests/helper_scripts/build_python.sh before running tests.
- Include new rules from bazelbuild/rules_python, which allow for
importing pip dependencies with Bazel.
- Make Cython BUILD file visible to WORKSPACE.
- Use a custom requirements file for Bazel python. This is added to
allow for requirements previously added only during build steps.