🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

noxfile.py

@@ -33,7 +33,6 @@
 LINT_PATHS = ["docs", "google", "tests", "noxfile.py", "setup.py"]
 
 DEFAULT_PYTHON_VERSION = "3.8"
-DEFAULT_MOCK_SERVER_TESTS_PYTHON_VERSION = "3.12"
 
 UNIT_TEST_PYTHON_VERSIONS: List[str] = [
     "3.7",
@@ -235,34 +234,6 @@ def unit(session, protobuf_implementation):
     )
 
 
-@nox.session(python=DEFAULT_MOCK_SERVER_TESTS_PYTHON_VERSION)
-def mockserver(session):
-    # Install all test dependencies, then install this package in-place.
-
-    constraints_path = str(
-        CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
-    )
-    # install_unittest_dependencies(session, "-c", constraints_path)
-    standard_deps = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_DEPENDENCIES
-    session.install(*standard_deps, "-c", constraints_path)
-    session.install("-e", ".", "-c", constraints_path)
-
-    # Run py.test against the mockserver tests.
-    session.run(
-        "py.test",
-        "--quiet",
-        f"--junitxml=unit_{session.python}_sponge_log.xml",
-        "--cov=google",
-        "--cov=tests/unit",
-        "--cov-append",
-        "--cov-config=.coveragerc",
-        "--cov-report=",
-        "--cov-fail-under=0",
-        os.path.join("tests", "mockserver_tests"),
-        *session.posargs,
-    )
-
-
 def install_systemtest_dependencies(session, *constraints):
     # Use pre-release gRPC for system tests.
     # Exclude version 1.52.0rc1 which has a known issue.