Added ATS Bullhorn Recruitment Cloud - Salesforce connection guide

[jerann]

---

Summary by cubic

Added a new connection guide for Bullhorn Recruitment Cloud - Salesforce (OAuth) to help users link accounts via StackOne. Also added the integration tile and related assets.

• New Features
  • OAuth setup steps using Client ID, Client Secret, and Salesforce URL.
  • Optional custom fields for TR1__Job_Board_Application__c, TR1__Application__c, Contact, and TR1__Job__c.
  • Notes on required object access; write operations may trigger automations.
  • Lists the available ATS resources (Applications, Documents, Notes, Candidates, Stages, Job Postings, Jobs).

[Copilot]

Pull Request Overview

This PR adds a new connection guide for integrating Bullhorn Recruitment Cloud - Salesforce (OAuth) into the ATS integrations catalog.

• Added a new integration tile for Bullhorn Recruitment Cloud - Salesforce on the integrations page
• Created comprehensive documentation for connecting to Bullhorn Recruitment Cloud - Salesforce via OAuth
• Documented required Salesforce objects, custom fields configuration, and available data resources

Reviewed Changes

Copilot reviewed 2 out of 4 changed files in this pull request and generated no comments.

File	Description
integrations.mdx	Added integration tile entry for Bullhorn Recruitment Cloud - Salesforce
connection-guides/ats/bullhorn_salesforce.mdx	New connection guide documenting authentication setup, configuration options, and available data resources

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[brycetoz]

LGTM