[Blockstore] split local nonrepl loadtests by backend

[kobzonega]

Notes

Allows the io_uring test target to be configured independently

• add NBS_LOCAL_NONREPL_BACKEND to select one backend in the shared local-nonrepl test;
• keep the existing embedded target focused on aio;
• add a separate embedded-io-uring target;
• register the new target in RECURSE_FOR_TESTS.

Issue

Sandbox tasks run tests on an older Linux kernel (<6.12) by default. The io_uring tests require features and fixes from a newer kernel, so enabling them in Arcadia also requires infrastructure changes that provide a suitable VM and kernel environment. This PR contains only the common parts that can be upstreamed to GitHub

[github-actions]

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All workloads for linux-x86_64-relwithdebinfo have completed.

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Planned checks for linux-x86_64-relwithdebinfo.

• 🚫 tasks + storage (cancelled or timed out before reporting completion)
• 🚫 blockstore (cancelled or timed out before reporting completion)
• 🚫 disk + manager (cancelled or timed out before reporting completion)
• 🚫 filestore (cancelled or timed out before reporting completion)

[github-actions]

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This is an automated comment that will be appended during run.

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All workloads for linux-x86_64-relwithdebinfo have completed.

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Planned checks for linux-x86_64-relwithdebinfo.

• ✅ blockstore

🔴 linux-x86_64-relwithdebinfo target: cloud/blockstore/ (test time: 12376s): some tests FAILED for commit f792a52.

TESTS	PASSED	ERRORS	FAILED	FAILED BUILD	SKIPPED	MUTED?
7530	7528	0	1	0	1	0

🟢 linux-x86_64-relwithdebinfo target: cloud/blockstore/ (test time: 296s): all tests PASSED for commit f792a52.

TESTS	PASSED	ERRORS	FAILED	FAILED BUILD	SKIPPED	MUTED?
2	2	0	0	0	0	0