Add Helm integration tests to GitHub actions workflow

[ChenYi015]

What you would like to be added?

Add Helm integration tests to GitHub actions workflow.

Why is this needed?

To make sure trainer Helm chart functions correctly.

Love this feature?

Give it a 👍 We prioritize the features with most 👍

[Electronic-Waste]

/remove-label lifecycle/needs-triage
/area testing

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.