ChangeFeed tests: Moves deterministic assertions to default-path tests

Agent-Logs-Url: https://github.com/Azure/azure-cosmos-dotnet-v3/sessions/2ecc1c73-658a-4358-ad20-9ecc87fb25fe

Co-authored-by: kirankumarkolli <6880899+kirankumarkolli@users.noreply.github.com>

Author: Copilot

Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.Tests/ChangeFeed/DocumentServiceLeaseManagerCosmosTests.cs

@@ -117,6 +117,10 @@ public async Task CreatesEPKBasedLease(int factoryType)
             Assert.AreEqual(feedRangeEpk.Range.Min, ((FeedRangeEpk)epkBasedLease.FeedRange).Range.Min);
             Assert.AreEqual(feedRangeEpk.Range.Max, ((FeedRangeEpk)epkBasedLease.FeedRange).Range.Max);
             ValidateRequestOptionsFactory(requestOptionsFactory, epkBasedLease);
+            if (requestOptionsFactory is PartitionedByPartitionKeyCollectionRequestOptionsFactory)
+            {
+                Assert.AreEqual(epkBasedLease.Id, epkBasedLease.PartitionKey);
+            }
         }
 
         [DataTestMethod]
@@ -163,6 +167,10 @@ public async Task CreatesPartitionKeyBasedLease(int factoryType)
             Assert.AreEqual(continuation, afterAcquire.ContinuationToken);
             Assert.AreEqual(partitionKeyRange.Id, pkRangeBasedLease.CurrentLeaseToken);
             ValidateRequestOptionsFactory(requestOptionsFactory, pkRangeBasedLease);
+            if (requestOptionsFactory is PartitionedByPartitionKeyCollectionRequestOptionsFactory)
+            {
+                Assert.AreEqual(pkRangeBasedLease.Id, pkRangeBasedLease.PartitionKey);
+            }
         }
 
         [TestMethod]
@@ -794,7 +802,6 @@ private static void ValidateRequestOptionsFactory(RequestOptionsFactory requestO
             else if (requestOptionsFactory is PartitionedByPartitionKeyCollectionRequestOptionsFactory)
             {
                 Assert.IsNotNull(lease.PartitionKey);
-                Assert.AreEqual(lease.Id, lease.PartitionKey);
             }
             else
             {