[New Integration] added SpecterOps BloodHound Enterprise integration

[omkarj-metron]

Proposed commit message

Add a new SpecterOps BloodHound Enterprise Fleet integration (bloodhound_enterprise v1.0.0).

WHAT:

• CEL-based Case & Alert Sync (health_check) that polls BloodHound Enterprise, creates/updates Elastic Security Cases, attaches Security Alerts for at-risk principals, and deletes stale cases
• Optional finding data stream for raw attack-path finding documents (disabled by default)
• Ingest pipelines, field mappings, package docs, and Attack Path Overview Kibana assets

WHY:

• Enable customers to track BloodHound Enterprise attack-path findings in Elastic Security Cases/Alerts for investigation and remediation

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

Author's Checklist

• Package lives under packages/bloodhound_enterprise/
• elastic-package check passes
• Pipeline tests pass for health_check and finding
• System tests pass and sample_event.json generated
• Docs rendered from _dev/build/docs/README.md
• Changelog link: updated to this PR URL after open
• CODEOWNERS entry coordinated with Elastic reviewers
• Leftover scaffold assets (e.g. unused log stream) removed if not intentional

[elastic-vault-github-plugin-prod]

Reviewers

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[omkarj-metron]

/test