Mute some flaky tests (#1293)

Author: CyberROFL

.github/config/muted_ya.txt

@@ -38,6 +38,8 @@ ydb/services/fq/ut_integration Yq_1.Basic_TaggedLiteral
 ydb/services/persqueue_v1/ut TPersQueueTest.DirectRead*
 ydb/services/persqueue_v1/ut [3/10]*
 ydb/services/ydb/sdk_sessions_pool_ut YdbSdkSessionsPool.StressTestSync*
+ydb/services/ydb/sdk_sessions_ut YdbSdkSessions.TestActiveSessionCountAfterBadSession
+ydb/services/ydb/sdk_sessions_ut [6/10]*
 ydb/services/ydb/table_split_ut YdbTableSplit.SplitByLoadWithReadsMultipleSplitsWithData
 ydb/services/ydb/ut YdbOlapStore.LogPagingAfter-NotNull
 ydb/services/ydb/ut YdbQueryService.TestCreateAndAttachSession