Katib: Add KATIB_POSTGRESQL_SSL_MODE variable of Katib DB Manager

[ckcd]

This follow-up PR reflects a change from kubeflow/katib#2266, which introduced a new environment variable option to allow users to specify the value of Postgres sslmode.

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

[google-oss-prow]

Hi @ckcd. Thanks for your PR.

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[ckcd]

@andreyvelich PTAL, thanks a lot.

[ckcd]

/assign @andreyvelich

[andreyvelich]

Thank you for the update @ckcd!
/ok-to-test
/lgtm
/approve

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ckcd]

@andreyvelich Thanks for your approval !