[INS-469] Added Rev detectors to defaults.go and gated it behind feature flag

[MuneebUllahKhan222]

Description:

This PR adds the existing Rev detector to defaults.go and ensures it is gated behind the appropriate feature flag.

Additionally, the PR updates the assertions in the existing integration tests to account for the changes made to the detector.Result struct.

Corpora Test:

The detector doesn't appear in the list.

Checklist:

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

---

Note

Medium Risk
Turning on a new default detector increases scan surface and live Rev API verification traffic; behavior is mitigated by a feature flag but enabled by default in OSS builds.

Overview
This PR enables the existing Rev API credential detector in the default engine detector list and wires it through the same feature-flag pattern used for Pinecone, Cloudinary, and GitLab OAuth (RevDetectorEnabled, default on in OSS main).

The Rev scanner now records both user and client key parts in SecretParts for multi-part credentials. Rev integration tests were updated to compare results with go-cmp, ignoring newer detector.Result fields that would otherwise make assertions brittle. go.sum grew with many new transitive module checksum lines (lockfile-only).

Note: defaults_test still lists DetectorType_Rev under intentionally excluded types until the test list is updated to match registration—worth confirming that test expectations are aligned with this change.

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[github-actions]

Corpora Test Results

No detector regex or keyword changes in this PR. Bench skipped.

[cursor]

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