Katib: Add SKIP_DB_INITIALIZATION variable of Katib DB Manager

[lkaybob]

This follow-up PR reflects a change from kubeflow/katib#2245, which introduced a new environment variable option to skip DB initialization when Katib DB manager is run.

It updates Katib DB Manager part of Environment Variables for Katib Components.

Closes #3656

[google-oss-prow]

Hi @lkaybob. Thanks for your PR.

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[Arhell]

/ok-to-test

[andreyvelich]

Thank you for updating this @lkaybob!
/lgtm
/approve

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andreyvelich, lkaybob

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