Add 'extra destructive' variant to WarningModal

[nicolethoen]

RHOAI has an implementation of a modal which would be an excellent extra feature of the WarningModal

It is the 'extra destructive' variant of the RHOAI DeleteModal. More info at this link:
https://pf-ai-infra-ui-components.surge.sh/ai-infra-ui-components/deletemodal

[fhlavac]

RHCLOUD-36638