Fix pip install tests for shelf-reader

Author: jobselko

pulp_python/tests/functional/api/test_consume_content.py

@@ -20,6 +20,7 @@ def test_pip_consume_content(
         "install",
         "--no-deps",
         "--no-cache-dir",
+        "--no-build-isolation",
         "--force-reinstall",
         "--trusted-host",
         urlsplit(distro.base_url).hostname,

pulp_python/tests/functional/api/test_domains.py

@@ -270,6 +270,7 @@ def test_domain_pypi_apis(
             "pip",
             "install",
             "--no-deps",
+            "--no-build-isolation",
             "--trusted-host",
             urlsplit(distro.base_url).hostname,
             "-i",