[Test] Add testkit infrastructure and refactor simple/converter tests#716

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GOODBOY008 wants to merge 3 commits into

apache:mainfrom

GOODBOY008:feature/ut-refactor

Commits on Jan 16, 2026

feat(test): add Excel-specific assertions and test data utilities
GOODBOY008
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refactor(test): sample Migrations for simple and convert unit test
GOODBOY008
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refactor: deprecate legacy converter classes and introduce unified model for converter tests
GOODBOY008
committed