Provide `ref` to BlameData query
What does this MR do and why?
Contributes to #436687 (closed)
Problem
getBlameData
query doesn't specify ref
argument. As a result, the
blame information is loaded for a default branch. It leads to incorrect
results when users request blame for non-default branches.
Solution
Specify ref
argument in GraphQL query.
MR acceptance checklist
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How to set up and validate locally
See steps to reproduce here: #436687 (closed)