Enable skip_test for HTTP audit backend

What does this MR do?

Enables skip_test option for the HTTP audit backend.

This prevents OpenBao from testing the HTTP audit backend upon initialization, which ultimately results in a broken state when the server handling these HTTP audit requests isn't ready.

Fixes OpenBao postUnseal fails when HTTP audit device... (gitlab-org/gitlab#582828 - closed).

More details in gitlab-org/gitlab#582828 (comment 3132039563)

Testing the charts in GKE

This solution was extensively tested in a cloud native environment. Details can be found in this thread

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