[APM] Add log_level config option to the Node.js Agent (#85346)

x-pack/plugins/apm/common/agent_configuration/setting_definitions/general_settings.ts

@@ -110,7 +110,7 @@ export const generalSettings: RawSettingDefinition[] = [
       { text: 'critical', value: 'critical' },
       { text: 'off', value: 'off' },
     ],
-    includeAgents: ['dotnet', 'ruby', 'java', 'python'],
+    includeAgents: ['dotnet', 'ruby', 'java', 'python', 'nodejs'],
   },
 
   // Recording

x-pack/plugins/apm/common/agent_configuration/setting_definitions/index.test.ts

@@ -100,6 +100,7 @@ describe('filterByAgent', () => {
     it('nodejs', () => {
       expect(getSettingKeysForAgent('nodejs')).toEqual([
         'capture_body',
+        'log_level',
         'transaction_max_spans',
         'transaction_sample_rate',
       ]);