Support DBCluster spec.PerformanceInsight updates

[a-hilaly]

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[ack-prow]

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This pull-request has been approved by: a-hilaly

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[ack-prow]

@a-hilaly: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
rds-verify-attribution	d89d208	link	false	/test rds-verify-attribution
rds-kind-e2e	d89d208	link	true	/test rds-kind-e2e

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