Add Clojars and Databricks secret detectors

[skbobo178-cmyk]

Summary

Adds Veles secret detectors for two accepted OSV-SCALIBR Patch Rewards Program requests:

• Clojars Deploy Tokens (CLOJARS_ followed by exactly 60 hexadecimal characters) for PRP: Secret extractor for Clojars Deploy Token #1749
• Databricks User Account Personal Access Tokens (dapi followed by 32 lowercase hexadecimal characters, with an optional single-digit suffix) for PRP: Secret extractor for DataBricks User Account Personal Access Token #1719

Both detectors use local regex-only matching and fake test tokens. No active validation or network calls are performed.

Test Plan

go test ./veles/secrets/clojars/... ./veles/secrets/databrickspat/... ./extractor/filesystem/list/...
go test ./veles/secrets/... ./extractor/filesystem/list/...

Notes

• The Clojars detector follows the issue's strict token format: CLOJARS_ + 60 hex characters.
• The Databricks detector intentionally uses a conservative known scanner-style pattern to reduce false positives: dapi + 32 lowercase hex characters, with optional -<digit> suffix.

Refs #1749
Refs #1719

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.