making TIndexTabletTest_Data::ShouldReturnBackendInfoForIOForOverloadedTabletActor more stable

[qkrorlqr]

Notes

Decreasing the probability of things like this: https://github-actions-s3.storage.eu-north2.nebius.cloud/ydb-platform/nbs/Nightly-build-(tsan)/29879592736/1/nebius-x86-64-tsan/logs/1/cloud/filestore/libs/storage/tablet/ut/test-results/unittest/chunk3/testing_out_stuff/TIndexTabletTest_Data.ShouldReturnBackendInfoForIOForOverloadedTabletActor128_KB.err

The test used to spend wall time doing read/write-blob ops caused by background ops which could sometimes cause the tablet to just wait without doing anything and without recording cpu cycles so eventually we could end up not recording any overload because of the following event sequence:

1. lots of WriteData calls - some overload is recorded
2. heavy bg ops start, the work is mostly done by read/write-blob actors, the tablet just waits
3. counters are updated - this time no overload is recorded because during step 2 the tablet actor & executor actor were almost idle
4. the test fails because of no overload

Issue

None

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🟢 linux-x86_64-relwithdebinfo target: cloud/filestore/ (test time: 5188s): all tests PASSED for commit 436f56f.

TESTS	PASSED	ERRORS	FAILED	FAILED BUILD	SKIPPED	MUTED?
4346	4346	0	0	0	0	0