Fix constant condition CodeQL warnings (#355)

Remove redundant `if` blocks to resolve CodeQL warnings about constant conditions.

Author: martincostello

src/Grafana.OpenTelemetry.Base/MeterProviderBuilderExtensions.cs

@@ -24,10 +24,7 @@ public static MeterProviderBuilder UseGrafana(this MeterProviderBuilder builder,
         {
             GrafanaOpenTelemetrySettings settings = new GrafanaOpenTelemetrySettings();
 
-            if (configure != null)
-            {
-                configure?.Invoke(settings);
-            }
+            configure?.Invoke(settings);
 
             GrafanaOpenTelemetryEventSource.Log.InitializeDistribution(settings);
 

src/Grafana.OpenTelemetry.Base/OpenTelemetryLoggerOptionsExtensions.cs

@@ -25,10 +25,7 @@ public static OpenTelemetryLoggerOptions UseGrafana(this OpenTelemetryLoggerOpti
         {
             GrafanaOpenTelemetrySettings settings = new GrafanaOpenTelemetrySettings();
 
-            if (configure != null)
-            {
-                configure?.Invoke(settings);
-            }
+            configure?.Invoke(settings);
 
             GrafanaOpenTelemetryEventSource.Log.InitializeDistribution(settings);
 

src/Grafana.OpenTelemetry.Base/TracerProviderBuilderExtensions.cs

@@ -24,10 +24,7 @@ public static TracerProviderBuilder UseGrafana(this TracerProviderBuilder builde
         {
             GrafanaOpenTelemetrySettings settings = new GrafanaOpenTelemetrySettings();
 
-            if (configure != null)
-            {
-                configure?.Invoke(settings);
-            }
+            configure?.Invoke(settings);
 
             GrafanaOpenTelemetryEventSource.Log.InitializeDistribution(settings);