Ignore TTxDataShardBuildIndexScan::ShadowBorrowCompaction for now (#4610)

Author: kungasc

.github/config/muted_ya.txt

@@ -31,6 +31,7 @@ ydb/core/persqueue/ut TPQTest.*DirectRead*
 ydb/core/persqueue/ut TopicAutoscaling.PartitionSplit_ManySession_NewSDK
 ydb/core/tx/coordinator/ut Coordinator.RestoreTenantConfiguration
 ydb/core/tx/datashard/ut_change_exchange Cdc.InitialScanDebezium
+ydb/core/tx/datashard/ut_build_index TTxDataShardBuildIndexScan::ShadowBorrowCompaction
 ydb/core/tx/schemeshard/ut_restore TImportTests.ShouldSucceedOnManyTables
 ydb/core/tx/schemeshard/ut_split_merge TSchemeShardSplitBySizeTest.Merge1KShards
 ydb/core/tx/tx_proxy/ut_ext_tenant TExtSubDomainTest.CreateTableInsideAndAlterDomainAndTable-AlterDatabaseCreateHiveFirst*