[INS-344] Add New Relic Mobile App Token Detector

[mustansir14]

Description:

This PR adds the New Relic Mobile App Token Detector.

Regex: \b((AA[0-9a-f]{40}|eu01xx[0-9a-f]{36})-NRMA)\b

• US region keys start with AA, followed by a 40 characters hexadecimal string, end with "-NRMA"
• EU region keys start with eu01xx, followed by a 36 characters hexadecimal string, end with "-NRMA"

Verification:
For verification, we use the New Relic Android Agent Internal API: https://mobile-collector.newrelic.com. A POST request is made to the /mobile/v5/connect endpoint. If the response status code is 400, it indicates that the key is valid but the request is malformed (since we're not sending a proper payload), while a 401 status code indicates that the key is invalid. Any other status code is treated as an error.
This API is not documented, and was discovered by digging into New Relic's Android agent SDK code.
Note: For EU region keys, the host should be https://mobile-collector.eu01.nr-data.net

Corpora Test:
The detector does not appear in the list.

Checklist:

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

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Note

Medium Risk
Medium risk due to adding a new network-backed verification path (new HTTP call and status-code semantics) plus a protobuf enum change that affects detector type numbering/serialization.

Overview
Adds a new newrelicmobileapptoken detector that matches US/EU Mobile App Token formats and optionally verifies tokens by POSTing to New Relic’s mobile collector endpoint (treating 400 as valid and 401 as invalid, with region recorded in ExtraData).

Wires the detector into defaults.go so it runs by default, and extends detectors.proto / generated detectors.pb.go with a new DetectorType_NewRelicMobileAppToken enum value. Includes unit tests for the regex/keyword matching and integration tests covering verified/unverified/region behavior, plus a benchmark.

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