build: fix presubmit

[parthea]

Fixes the error seen in #256 which occurred because opentelemetry was added as a direct dependency of google-cloud-pubsub and we run tests against pubsub via this code

python-api-common-protos/noxfile.py

Lines 175 to 176 in f30115b

	def test(session, library, prerelease, protobuf_implementation):
	"""Run tests from a downstream libraries.

==================================== ERRORS ====================================
____________________ ERROR collecting tests/unit/pubsub_v1 _____________________
/usr/local/lib/python3.12/importlib/__init__.py:90: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
:1381: in _gcd_import
    ???
:1354: in _find_and_load
    ???
:1325: in _find_and_load_unlocked
    ???
:929: in _load_unlocked
    ???
/tmpfs/src/github/python-api-common-protos/.nox/bd36180c/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:184: in exec_module
    exec(co, module.__dict__)
tests/unit/pubsub_v1/conftest.py:17: in 
    from opentelemetry.sdk.trace import TracerProvider
E   ModuleNotFoundError: No module named 'opentelemetry'
__________________ ERROR collecting tests/unit/test_pubsub.py __________________
ImportError while importing test module '/tmp/tmp765ev_kc/python-pubsub/tests/unit/test_pubsub.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/local/lib/python3.12/importlib/__init__.py:90: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
tests/unit/test_pubsub.py:15: in 
    from google.cloud import pubsub
google/cloud/pubsub/__init__.py:20: in 
    from google.cloud.pubsub_v1 import PublisherClient
google/cloud/pubsub_v1/__init__.py:18: in 
    from google.cloud.pubsub_v1 import publisher
google/cloud/pubsub_v1/publisher/__init__.py:17: in 
    from google.cloud.pubsub_v1.publisher.client import Client
google/cloud/pubsub_v1/publisher/client.py:34: in 
    from google.cloud.pubsub_v1.publisher._batch import thread
google/cloud/pubsub_v1/publisher/_batch/thread.py:24: in 
    from opentelemetry import trace
E   ModuleNotFoundError: No module named 'opentelemetry'

[ohmayr]

Why not move it outside the conditional logic like before and have a single session.install towards the end. It seems to be that we probably just want to remove install_command.extend(["--no-deps"])

[parthea]

The install_prerelease_dependencies has several install commands where we install pre-release versions of dependencies. I wanted to make sure to install the dependencies of the downstream client before upgrading to the pre-release versions of dependencies. If we did this at the end , we may downgrade the pre-release dependencies