Remove workarounds

Author: MichelZ

src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/SqlNotificationTest/SqlNotificationTest.cs

@@ -244,7 +244,7 @@ public void Test_SingleDependency_Timeout()
                 const int SqlDependencyTimerResolution = 15; // seconds
                 const int testTimeSeconds = SqlDependencyTimerResolution * 3 - 5;
                 const int minTimeoutEventInterval = testTimeSeconds - 1;
-                const int maxTimeoutEventInterval = testTimeSeconds + SqlDependencyTimerResolution + 1 + 15; // TEMPORARILY ADD 15 SECONDS TO ALLOW FOR TIMEOUT TO BE RECEIVED AS A TEST
+                const int maxTimeoutEventInterval = testTimeSeconds + SqlDependencyTimerResolution + 1;
 
                 // create a new event every time to avoid mixing notification callbacks
                 ManualResetEventSlim notificationReceived = new ManualResetEventSlim(false);

src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/TransactionTest/TransactionEnlistmentTest.cs

@@ -50,6 +50,7 @@ public static void TestManualEnlistment_Enlist_TxScopeComplete()
         [ConditionalFact(typeof(DataTestUtility), nameof(DataTestUtility.AreConnStringsSetup), nameof(DataTestUtility.IsSupportingDistributedTransactions))]
         public static void TestEnlistmentPrepare_TxScopeComplete()
         {
+            TransactionManager.ImplicitDistributedTransactions = true;
             Assert.Throws<TransactionAbortedException>( () =>
             {
                 using TransactionScope txScope = new(TransactionScopeOption.RequiresNew, new TransactionOptions()