ci: ignore collect import error on CI with env var

.gitlab/ci/host-test.yml

@@ -365,6 +365,8 @@ test_pytest_macos:
       - "**/build*/build_log.txt"
     reports:
       junit: XUNIT_RESULT.xml
+  variables:
+    PYTEST_IGNORE_COLLECT_IMPORT_ERROR: "1"
   script:
     - run_cmd python tools/ci/ci_build_apps.py components examples tools/test_apps -vv
       --target linux

tools/ci/idf_pytest/plugin.py

@@ -141,7 +141,7 @@ class IdfPytestEmbedded:
 
     def pytest_collectstart(self) -> None:
         # mock the optional packages while collecting locally
-        if not os.getenv('CI_JOB_ID'):
+        if not os.getenv('CI_JOB_ID') or os.getenv('PYTEST_IGNORE_COLLECT_IMPORT_ERROR') == '1':
             # optional packages required by test scripts
             for p in [
                 'scapy',