Add pipeline url to webhook payload

What does this MR do and why?

Add pipeline url to webhook payload

Changelog: added

Screenshots or screen recordings

How to set up and validate locally

1. Add a webhook on this link to capture events. Make sure to check Pipeline events in the Trigger section to receive pipeline events.
2. Go to Pipelines and click on Run pipeline then start the pipeline on master by clicking on Run pipeline.
3. Check the logs at this link. Click on Edit next to the created webhook in Step 1.
4. Scroll down to see the latest webhook and click on Recent Details. You should see the added url field inside object_attributes.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.