fix: set the value of testingType in project-ct (cypress-io#16885)

packages/server-ct/src/project-ct.ts

@@ -89,6 +89,13 @@ export class ProjectCt extends ProjectBase<ServerCt> {
 
       updatedConfig.componentTesting = true
 
+      // This value is normally set up in the `packages/server/lib/plugins/index.js#110`
+      // But if we don't return it in the plugins function, it never gets set
+      // Since there is no chance that it will have any other value here, we set it to "component"
+      // This allows users to not return config in the `cypress/plugins/index.js` file
+      // https://github.com/cypress-io/cypress/issues/16860
+      updatedConfig.resolved.testingType = { value: 'component' }
+
       debug('updated config: %o', updatedConfig)
 
       return updatedConfig