engine: use an unlocked version of Get() in processAddrDelete()

[roman-khimov]

processAddrDelete is supposed to be called with RLock taken on e.blockMtx and that's correct for its callers. Then it shouldn't RLock it again which is what it tries to do by calling Get(). This leads to deadlock between Close() and GC routine running in background:

goroutine 787 [sync.RWMutex.Lock, 9 minutes]:
sync.runtime_SemacquireRWMutex(0xc000304cfc?, 0x1?, 0x1002d90?)
	/opt/hostedtoolcache/go/1.24.13/x64/src/runtime/sema.go:105 +0x25
sync.(*RWMutex).Lock(0xc000304ce8)
	/opt/hostedtoolcache/go/1.24.13/x64/src/sync/rwmutex.go:155 +0x89
github.com/nspcc-dev/neofs-node/pkg/local_object_storage/engine.(*StorageEngine).setBlockExecErr(0xc000304cb0, {0x1546240, 0x1c12290})
	/home/runner/work/neofs-node/neofs-node/pkg/local_object_storage/engine/control.go:106 +0x65
github.com/nspcc-dev/neofs-node/pkg/local_object_storage/engine.(*StorageEngine).Close(0xc000304cb0)
	/home/runner/work/neofs-node/neofs-node/pkg/local_object_storage/engine/control.go:76 +0xd0
github.com/nspcc-dev/neofs-node/pkg/local_object_storage/engine.TestChildrenExpiration.func1()
	/home/runner/work/neofs-node/neofs-node/pkg/local_object_storage/engine/gc_test.go:54 +0x2f
testing.(*common).Cleanup.func1()
	/opt/hostedtoolcache/go/1.24.13/x64/src/testing/testing.go:1211 +0x170
testing.(*common).runCleanup(0xc0003af6c0, 0x0)
	/opt/hostedtoolcache/go/1.24.13/x64/src/testing/testing.go:1445 +0x2b4
testing.tRunner.func2()
	/opt/hostedtoolcache/go/1.24.13/x64/src/testing/testing.go:1786 +0x4d
testing.tRunner(0xc0003af6c0, 0x14184f8)
	/opt/hostedtoolcache/go/1.24.13/x64/src/testing/testing.go:1798 +0x25f
created by testing.(*T).Run in goroutine 1
	/opt/hostedtoolcache/go/1.24.13/x64/src/testing/testing.go:1851 +0x8f3

goroutine 753 [sync.RWMutex.RLock, 9 minutes]:
sync.runtime_SemacquireRWMutexR(0xc000304cf8?, 0x1?, 0x1017465?)
	/opt/hostedtoolcache/go/1.24.13/x64/src/runtime/sema.go:100 +0x25
sync.(*RWMutex).RLock(0xc000304ce8)
	/opt/hostedtoolcache/go/1.24.13/x64/src/sync/rwmutex.go:74 +0x5b
github.com/nspcc-dev/neofs-node/pkg/local_object_storage/engine.(*StorageEngine).Get(0xc000304cb0, {{0x3c, 0xa9, 0x7, 0xc9, 0x47, 0xd8, 0x5c, 0x4e, 0xb2, ...}, ...})
	/home/runner/work/neofs-node/neofs-node/pkg/local_object_storage/engine/get.go:34 +0x211
github.com/nspcc-dev/neofs-node/pkg/local_object_storage/engine.(*StorageEngine).processAddrDelete(0xc000304cb0, {{0x3c, 0xa9, 0x7, 0xc9, 0x47, 0xd8, 0x5c, 0x4e, 0xb2, ...}, ...}, ...)
	/home/runner/work/neofs-node/neofs-node/pkg/local_object_storage/engine/inhume.go:99 +0x1065
github.com/nspcc-dev/neofs-node/pkg/local_object_storage/engine.(*StorageEngine).processExpiredObjects(0xc000304cb0, {0xc00050ee40, 0x1, 0x1336669?})
	/home/runner/work/neofs-node/neofs-node/pkg/local_object_storage/engine/inhume.go:269 +0x4c6
github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard.(*Shard).collectExpiredObjects(0xc000035240)
	/home/runner/work/neofs-node/neofs-node/pkg/local_object_storage/shard/gc.go:238 +0xb2e
github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard.(*Shard).removeGarbage(0xc000035240)
	/home/runner/work/neofs-node/neofs-node/pkg/local_object_storage/shard/gc.go:149 +0x125
github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard.(*gc).tickRemover(0xc000572960)
	/home/runner/work/neofs-node/neofs-node/pkg/local_object_storage/shard/gc.go:120 +0x116
created by github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard.(*gc).init in goroutine 787
	/home/runner/work/neofs-node/neofs-node/pkg/local_object_storage/shard/gc.go:81 +0xa5

Fixes #3835.

Related to 60d0d3a.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 25.54%. Comparing base (52149c0) to head (8ffbc52).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3837      +/-   ##
==========================================
- Coverage   25.55%   25.54%   -0.01%     
==========================================
  Files         669      669              
  Lines       42941    42943       +2     
==========================================
- Hits        10973    10971       -2     
- Misses      30965    30967       +2     
- Partials     1003     1005       +2     

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