fix: verify flaky tests

[ericzzzzzzz]

Description

• We've been seeing some verify and custom actions related flaky tests on Kokoro tests
• The cause is that some integration tests contaminate each other, and this is more likely to happen on gcp tests, as we're running tests against shared remote clusters concurrently-- 4 worker nodes running tests against one shared remote cluster, adding namespace for integration tests should provide the isolation but namespace flag is not added in verify and exec command. enable namespace flag for command verify and exec #9051
• Github CI should provide better isolation , each worker runs tests against its dedicated minikube -- not 100% sure , but we should also isolate these tests by providing unique names as job names so when skaffold run query to watch resources it can watch the correct resource.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.47%. Comparing base (290280e) to head (4ed037e).
⚠️ Report is 1426 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9050      +/-   ##
==========================================
- Coverage   70.48%   63.47%   -7.01%     
==========================================
  Files         515      624     +109     
  Lines       23150    32024    +8874     
==========================================
+ Hits        16317    20327    +4010     
- Misses       5776    10162    +4386     
- Partials     1057     1535     +478     

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