Fix import issue

[maximyurchuk]

Проблема в том, что пути не подменяются при импорте в Аркадию
#16120

[github-actions]

🟢 2025-04-02 14:56:59 UTC The validation of the Pull Request description is successful.

[Copilot]

Pull Request Overview

The PR addresses an import issue in the test configuration by consolidating plugin references into named constants for clarity and consistency.

• Replaces inline string literals with the COMMON_FIXTURES and FLAVOURS_FIXTURE variables.
• Updates the pytest_plugins list to reference these constants, potentially reducing import errors.

[github-actions]

⚪ 2025-03-27 09:37:48 UTC Pre-commit check linux-x86_64-relwithdebinfo for 8cb179d has started.
⚪ 2025-03-27 09:38:02 UTC Artifacts will be uploaded here
⚪ 2025-03-27 09:40:15 UTC ya make is running...
🟢 2025-03-27 09:48:46 UTC Tests successful.

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
140	132	0	0	2	6

🟢 2025-03-27 09:48:53 UTC Build successful.
🟡 2025-03-27 09:49:02 UTC ydbd size 2.2 GiB changed* by +228.6 KiB, which is >= 100.0 KiB vs main: Warning

ydbd size dash	main: 9323dd4	merge: 8cb179d	diff	diff %
ydbd size	2 343 292 816 Bytes	2 343 526 856 Bytes	+228.6 KiB	+0.010%
ydbd stripped size	490 037 664 Bytes	490 086 560 Bytes	+47.8 KiB	+0.010%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2025-03-27 09:38:55 UTC Pre-commit check linux-x86_64-release-asan for 8cb179d has started.
⚪ 2025-03-27 09:39:10 UTC Artifacts will be uploaded here
⚪ 2025-03-27 09:42:03 UTC ya make is running...
🟢 2025-03-27 09:44:26 UTC Tests successful.

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
13	13	0	0	0	0

🟢 2025-03-27 09:44:33 UTC Build successful.
🟡 2025-03-27 09:44:45 UTC ydbd size 3.8 GiB changed* by +391.0 KiB, which is >= 100.0 KiB vs main: Warning

ydbd size dash	main: 9323dd4	merge: 8cb179d	diff	diff %
ydbd size	4 111 917 488 Bytes	4 112 317 896 Bytes	+391.0 KiB	+0.010%
ydbd stripped size	1 420 950 248 Bytes	1 421 086 568 Bytes	+133.1 KiB	+0.010%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}