Autosummary for setClaim

- setClaim now uses the Summary class to build autosummaries
- UnitTests added for ClaimDifference & ClaimSummaryBuilder
- Selenium tests for autocomments in follow-up I457f42d

Bug: 45840
Bug: 45100

Change-Id: I6e90d80fc3d8d579f218a5d77906674e968d126c
Merge "Autosummary for setClaim"