Some of our pilorama tests fail on CI.
The reasons are not obvious, but one possible improvement
is using `WithNoSync` option for these. It should have much effect,
because we are writing on the tmpfs, but doesn't hurt anyway.
If I replace `t.TempDir()` with a local directory, test execution time
goes down from 5s (sync) to 0.4s (nosync), which is the same time as
with `t.TempDir()`. Maybe we have some strange CI configuration.
```
panic: test timed out after 10m0s
running tests:
TestForest_ApplyRandom (8m22s)
TestForest_ApplyRandom/bbolt (8m21s)
...
goroutine 170 [syscall]:
syscall.Syscall(0xc000100000?, 0xc00047b758?, 0x6aff9a?, 0xc00041c1b0?)
/opt/hostedtoolcache/go/1.20.7/x64/src/syscall/syscall_linux.go:69 +0x27
syscall.Fdatasync(0x9e35c0?)
/opt/hostedtoolcache/go/1.20.7/x64/src/syscall/zsyscall_linux_amd64.go:418 +0x2a
go.etcd.io/bbolt.fdatasync(0xc000189000?)
```
Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>
