[INT-6498] HRIS Hibob: Add Configure Webhook Guide For Testing External Trigger Token/Url

[alihuzaifa-stackone]

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Summary by cubic

Adds a Configure Webhooks section to the Hibob HRIS connection guide so users can set up and test the External Trigger URL and Token for time-off webhooks. Fulfills INT-6498 by adding clear steps, a testing flow, and links to our guide and Hibob docs.

• New Features
  • Added link to StackOne Hibob Webhook Configuration Guide.
  • Added test steps and a warning about deactivation when no 200 response is received, plus a link to Hibob’s webhook docs.

^{Written for commit da3883e. Summary will update on new commits.}

[Copilot]

Pull request overview

This PR adds documentation for configuring and testing Hibob webhooks to enable real-time data synchronization with time-off events. The new section guides users through the webhook setup process using the External Trigger Token provided by StackOne.

Key changes:

• Added a "Configure Webhooks" section with a link to the detailed webhook configuration guide
• Included testing instructions for validating webhook functionality
• Added warnings about webhook deactivation on test failure

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