[xy] Support query pipelines with repo_path.

[wangxiaoyou1993]

Description

Support query pipelines with repo_path.
This can be used to fetch pipelines with sub project path via API.

How Has This Been Tested?

• Tested with local pipeline API

http://localhost:6789/api/pipelines?repo_path=/home/src/multi_project/sub_project2&_limit=30&_offset=0&search=&include_schedules=1&api_key=xxx

Checklist

• The PR is tagged with proper labels (bug, enhancement, feature, documentation)
• I have performed a self-review of my own code
• I have added unit tests that prove my fix is effective or that my feature works
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

cc: