Added high-level tests for login behavior

[n00bcracker]

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Description for reviewers

Also rewrote sysview auth tests not to use SchemeShard events directly, because usage plain password in these events will be deprecated.
It's needed to move passwords hash computing from SchemeShard in further PRs.

[github-actions]

🟢 2026-01-02 15:28:52 UTC The validation of the Pull Request description is successful.

[ydbot]

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

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Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
351	350	0	0	0	1

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Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
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Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
475	474	0	0	0	1

🟢 2026-01-12 16:36:05 UTC Build successful.

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stable-25-3, stable-25-3-1, stable-25-4
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