Update test method setup to avoid creating build plugin until it's determined that we're in the version of the support package with gRPC

Author: sameagen-MW

test/tbuildtoolplugin.m

@@ -29,11 +29,11 @@ function setup(testCase)
         end
 
         function onlyTestIfgRPCIsInstalled(testCase)
+            % Do not run if gRPC is not installed
             testCase.assumeTrue(logical(exist("opentelemetry.exporters.otlp.OtlpGrpcSpanExporter", "class")), ...
                 "Otlp gRPC exporter must be installed.");
-        end
-        
-        function createBuildRunner(testCase)
+
+            % Set up build runner
             plugin = matlab.buildtool.plugins.OpenTelemetryPlugin();
             testCase.BuildRunner = matlab.buildtool.BuildRunner.withNoPlugins();
             testCase.BuildRunner.addPlugin(plugin);
@@ -474,4 +474,4 @@ function buildToolDoesNotConfigureOTelWhenEnvVariableSet(testCase)
     end
 
     error("No span found");
-end
+end