WIP: Added API endpoints to return bridges data

What does this MR do?

Closes #207996 (closed)
Added API endpoints to return bridges data of project/pipeline.
Some Unit Tests are added. Working on adding more.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content