Fix: Use correct method to uninstall plugins during rollback

The rollback called `this.contentplugin.uninstallPlugin()` which does
not exist on ContentPluginModule. The correct method is `delete()`.
This caused a TypeError that masked the original import error and
prevented proper cleanup of newly installed plugins.

Author: taylortom

lib/AdaptFrameworkImport.js

@@ -881,7 +881,7 @@ class AdaptFrameworkImport {
     // Uninstall newly installed plugins
     if (this.contentplugin) {
       tasks.push(...Object.values(this.newContentPlugins).map(p =>
-        this.contentplugin.uninstallPlugin(p._id)
+        this.contentplugin.delete({ _id: p._id })
           .catch(e => log('warn', `failed to uninstall plugin '${p.name}'`, e))
       ))
     }

tests/AdaptFrameworkImport.spec.js

@@ -416,7 +416,7 @@ describe('AdaptFrameworkImport', () => {
       const uninstalled = []
       const ctx = makeRollbackCtx({
         contentplugin: {
-          uninstallPlugin: async (id) => uninstalled.push(id)
+          delete: async ({ _id }) => uninstalled.push(_id)
         },
         newContentPlugins: {
           'adapt-contrib-text': { _id: 'p1', name: 'adapt-contrib-text' },
@@ -515,9 +515,9 @@ describe('AdaptFrameworkImport', () => {
       const uninstalled = []
       const ctx = makeRollbackCtx({
         contentplugin: {
-          uninstallPlugin: async (id) => {
-            if (id === 'p1') throw new Error('uninstall failed')
-            uninstalled.push(id)
+          delete: async ({ _id }) => {
+            if (_id === 'p1') throw new Error('uninstall failed')
+            uninstalled.push(_id)
           }
         },
         newContentPlugins: {