skip running test in github ci

- We have defined github rules in github workflow for skipping running tests, example: https://github.com/GoogleContainerTools/skaffold/blob/62ee1ab9b0e19c954076cb722556ea2512dad9de/.github/workflows/unit-tests-linux.yml#L28-L35
- The setup for skipping tests is not working, due to we re-named docs folder while migrating skaffold v2 from v1, we should ignore ``v1-docs/**``, ``v1-docs/**`` now
- There seem to be a simpler way for running a github workflow with only filtered file changes. https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#example-excluding-paths
- we may be able to use this pattern to specify on what condition we want to run certain github workflow.