Group triaging after cl level triage changes.

Two alternatives:

1. Rewrite check-duplicate-failures handler
2. When triaging a cl, also check all the builds with the same suspected_cl and failures and update them as well.

No matter which approach we take, following entities and fields need to be updated:
1. WfSuspectedCL
  a. modify all the builds in suspected_cl.builds if the failures are the same 
  b. modify suspected_cl.status if needed

2. WfAnalysis
  a. modify the cl in each analysis' suspected_cls.
  b. modify analysis.result_status if needed.