feat: add Incidents backend

[falox]

This PR adds the Incidents backend.

When the incidents feature flag is set, the UIPlugin controller installs the Health Analyzer and the resources associated with it.

Fixes: OBSINTA-471

[openshift-ci]

Hi @falox. Thanks for your PR.

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[jgbernalp]

/lgtm

[jan--f]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: falox, jan--f

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