Lower relevancy threshold and increase max relevant functions for seq… (#860)

This commit adjusts the parameters of the sequential planner to improve
its performance and accuracy. The relevancy threshold is lowered from
0.70 to 0.65, which allows more functions to be considered as potential
candidates for the plan. The max relevant functions is increased from 20
to 30, which gives the planner more options to choose from and reduces
the risk of missing a suitable function. These changes are expected to
enhance the quality of the plans generated by the planner and make them
more aligned with the user's intent.

Co-authored-by: Lee Miller <[email protected]>

Author: lemillermicrosoft

dotnet/src/IntegrationTests/Planning/SequentialPlanner/SequentialPlannerTests.cs

@@ -85,7 +85,7 @@ public async Task CreatePlanGoalRelevantAsync(string prompt, string expectedFunc
         TestHelpers.ImportSampleSkills(kernel);
 
         var planner = new Microsoft.SemanticKernel.Planning.SequentialPlanner(kernel,
-            new SequentialPlannerConfig { RelevancyThreshold = 0.70, MaxRelevantFunctions = 20 });
+            new SequentialPlannerConfig { RelevancyThreshold = 0.65, MaxRelevantFunctions = 30 });
 
         // Act
         var plan = await planner.CreatePlanAsync(prompt);