Profiling Serverless - Add function name tag

Add a functionname tag in the profiling data.
This is required for the billing logics to work in serverless environments.

Author: r1viollet

internal-api/src/main/java/datadog/trace/api/Config.java

@@ -2,7 +2,6 @@
 
 import static datadog.trace.api.ConfigDefaults.*;
 import static datadog.trace.api.DDTags.*;
-import static datadog.trace.api.DDTags.PROFILING_ENABLED;
 import static datadog.trace.api.config.AppSecConfig.*;
 import static datadog.trace.api.config.CiVisibilityConfig.*;
 import static datadog.trace.api.config.CrashTrackingConfig.*;
@@ -3432,6 +3431,9 @@ public Map<String, String> getMergedProfilingTags() {
     if (azureAppServices) {
       result.putAll(getAzureAppServicesTags());
     }
+    if (ServerlessInfo.get().isRunningInServerlessEnvironment()) {
+      result.put("functionname", ServerlessInfo.get().getFunctionName());
+    }
     return Collections.unmodifiableMap(result);
   }