Add e2e for active health checking

[lemonlinger]

Description:

Describe the desired behavior, what scenario it enables and how it
would be used.

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[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 30 days.

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 30 days.

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 30 days.

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 30 days.

[shawnh2]

closed in favor of #3677

[aoledk]

closed in favor of #3677

#3677 only add case for backend active health check with http, tcp is still not checked in e2e, looks like echo-basic can't be used to check active tcp health check. Perhaps we should address tcp in new issue.