Fix Race conditions, thread-safety issues, and code quality in Developer Balance sample#751

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Dhivya-SF4094 wants to merge 5 commits intodotnet:mainfrom

Dhivya-SF4094:fix-748

Commits on Apr 5, 2026

Fixed Race conditions, thread-safety issues
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Commits on Apr 6, 2026

Updated fix for SeedDataService.ClearTables() called Task.WhenAll on all four repositories
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Updated fix in all four repository
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Commits on Apr 7, 2026