Split out detector types into separate proto file in order to narrow CODEOWNERS scope

[casey-tran]

Description:

We want to move the detector types out of the Scanning team purview. So I split off detector types into its own proto file (so that file detector_type.proto can be owned by the Integrations team), regenerated the pb files with "make protos", and made the detector files use the new generated detector_type.pb.go.

Checklist:

• Tests passing (make test-community)?
• Lint passing (make lint this requires golangci-lint)?

---

Note

Medium Risk
Broad mechanical refactor across many detectors and config parsing to use the new detector_typepb.DetectorType enum, which could cause build/runtime mismatches if any call sites or generated protos were missed. No behavioral changes are intended beyond type/ownership wiring.

Overview
Moves the DetectorType enum into a new proto/detector_type.proto (with regenerated Go bindings under pkg/pb/detector_typepb) and updates config parsing (pkg/config/detectors*) plus detector implementations/tests to reference detector_typepb.DetectorType instead of detectorspb.DetectorType.

Updates CODEOWNERS so proto/detector_type.proto is owned by Integrations, narrowing review scope for detector-type changes while keeping the rest of proto/ shared.

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