Display link to staging project in conversation

[saraycp]

When the request has a review by project and that project is a staging one, we display a link to it instead of plain text.

Test with this review-app link: https://obs-reviewlab.opensuse.org/saraycp-staging_project_link/request/show/2
Or do:

• Join beta request redesign
• Add review
• Choose review by project
• Which project? A project which is a staging project already
• You'll see the new link in the conversation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.08%. Comparing base (47aaaea) to head (9c6ff2e).
Report is 3 commits behind head on master.

❗ Current head 9c6ff2e differs from pull request most recent head 5a671c0. Consider uploading reports for the commit 5a671c0 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #15860      +/-   ##
==========================================
- Coverage   86.09%   86.08%   -0.01%     
==========================================
  Files         794      794              
  Lines       26032    26024       -8     
==========================================
- Hits        22411    22403       -8     
  Misses       3621     3621              

[obs-bot]

Review app will appear here: http://obs-reviewlab.opensuse.org/saraycp-staging_project_link