ci: replace trivy scan action with one in Flagsmith/actions repo #9998

Job	Run time
Check actor permissions	4s
Add Conventional Commit labels	4s
Prepare Docker report comment	11s
Build API Test Image / Build flagsmith-api-test image	1s
Build API Image / Build and verify flagsmith-api image	1s
Build Frontend Image / Build and verify flagsmith-frontend image	1s
Build Private Cloud Image / Build and verify flagsmith-private-cloud image	2s
Build Unified Image / Build and verify flagsmith image	1s
Build E2E Image / Build flagsmith-e2e image	1s
run-e2e-tests (ARM64-2c, versioning, 1) / E2E: versioning	8m 5s
run-e2e-tests (ARM64-2c, segment-part-3 signup flag invite project, 2) / E2E: segment-part-3 signup flag invite project	9m 46s
run-e2e-tests (ARM64-2c, segment-part-2, 1) / E2E: segment-part-2	9m 20s
run-e2e-tests (ARM64-2c, segment-part-1 environment, 1) / E2E: segment-part-1 environment	8m 59s
run-e2e-tests (ubuntu-latest, segment-part-2, 1) / E2E: segment-part-2	5m 41s
run-e2e-tests (ubuntu-latest, segment-part-1 environment, 1) / E2E: segment-part-1 environment	5m 11s
run-e2e-tests (ubuntu-latest, segment-part-3 signup flag invite project, 2) / E2E: segment-part-3 signup flag invite project	5m 49s
run-e2e-tests (ubuntu-latest, versioning, 1) / E2E: versioning	4m 50s
	58m 7s

Provide feedback