Fix issue, where span status is incorrect in case of error

Author: rolaca11

instrumentation/ktor/ktor-2-common/library/src/main/kotlin/io/opentelemetry/instrumentation/ktor/v2_0/common/internal/KtorServerTelemetryUtil.kt

@@ -40,19 +40,25 @@ object KtorServerTelemetryUtil {
       if (context != null) {
         call.attributes.put(contextKey, context)
         withContext(context.asContextElement()) {
-          try {
-            proceed()
-          } catch (err: Throwable) {
-            // Stash error for reporting later since need ktor to finish setting up the response
-            call.attributes.put(errorKey, err)
-            throw err
-          }
+          proceed()
         }
       } else {
         proceed()
       }
     }
 
+    val errorPhase = PipelinePhase("OpenTelemetryError")
+    application.insertPhaseBefore(ApplicationCallPipeline.Monitoring, errorPhase)
+    application.intercept(errorPhase) {
+      try {
+        proceed()
+      } catch (err: Throwable) {
+        // Stash error for reporting later since need ktor to finish setting up the response
+        call.attributes.put(errorKey, err)
+        throw err
+      }
+    }
+
     val postSendPhase = PipelinePhase("OpenTelemetryPostSend")
     application.sendPipeline.insertPhaseAfter(ApplicationSendPipeline.After, postSendPhase)
     application.sendPipeline.intercept(postSendPhase) {