commit: Convert FindCommits tests to support SHA256
This MR refactors tests for the FindCommits RPC to support the SHA256 object format.
Part of adapt service/commit (part 2) tests to support ... (#5435 - closed).
This MR refactors tests for the FindCommits RPC to support the SHA256 object format.
Part of adapt service/commit (part 2) tests to support ... (#5435 - closed).