fix(ci): correct workflow unit test

[lvxinyu-1117]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
backend/application/workflow/workflow.go	50.98% <100.00%> (+36.36%)	⬆️
...kend/domain/workflow/internal/nodes/entry/entry.go	76.19% <100.00%> (+38.90%)	⬆️
...al/nodes/variableaggregator/variable_aggregator.go	65.18% <100.00%> (+38.94%)	⬆️

... and 87 files with indirect coverage changes

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