invert check condition

[ubyte]

#30109

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⚪ 2025-12-04 12:16:18 UTC Pre-commit check linux-x86_64-release-asan for e6c5e92 has started.
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TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
634	634	0	0	0	0

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Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
642	642	0	0	0	0

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Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
634	634	0	0	0	0

🟢 2025-12-04 13:50:48 UTC Build successful.

[github-actions]

⚪ 2025-12-04 13:44:50 UTC Pre-commit check linux-x86_64-relwithdebinfo for f08ce33 has started.
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⚪ 2025-12-04 13:47:13 UTC ya make is running...
🟢 2025-12-04 13:50:08 UTC Tests successful.

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
642	642	0	0	0	0

🟢 2025-12-04 13:50:16 UTC Build successful.

[Copilot]

Pull request overview

This PR fixes incorrect usage of the Y_ENSURE macro in two methods of the TFlatDbWrapper test class. The original code passed only a string literal to Y_ENSURE, which would always evaluate to true (truthy), preventing the intended assertion from triggering. The fix adds an explicit false condition as the first parameter, ensuring these unsupported methods properly fail with an error message when called.

• Corrects Y_ENSURE macro usage to properly assert failure conditions
• Fixes two methods (Init and FinishTransaction) that should always fail with "Not supported" errors

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Branch	Run
stable-25-2, stable-25-2-1, stable-25-3, stable-25-3-1
stable-25-3, stable-25-3-1
stable-25-3