Support policies that check `DELETE` requests

[viccuad]

Per RFC, the audit-scanner should evaluate policies and create fake CREATE, DELETE requests. We are only doing so for CREATE requests for now.

Acceptance criteria

• Check that policies targeting DELETE requests are being considered in the filter and included.
• Generate DELETE requests, the same way we do for CREATE requests, and make sure they are included by the filter, for those policies that check DELETE requests.
• Provide unit tests.
• Provide if needed.

[flavio]

This is a nice to have feature, but not mandatory for the initial release of the audit scanner

[flavio]

not really an epic, but this is how cards are shown on the roadmap board