chore: sync security config files

[security-config-sync]

Summary

This PR syncs security scanning configuration files from the central security-config repository, managed by the @opendatahub-io/odh-platform-security team.

Files

File	Status
semgrep.yaml	Added
.gitleaksignore	Added
.gitleaks.toml	Added

What does this mean for your team?

• No action required from reviewers beyond merging this PR
• These files are protected by an org-level push ruleset — they cannot be modified directly in this repo
• Future updates will be synced automatically via PRs from the security-config repo
• CodeRabbit and Semgrep will use these configs when reviewing PRs on this repo

For questions or customization requests, open an issue on opendatahub-io/security-config.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sutaakar

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