[RIDER] Add veto mechanism for AI Assistant plugin load RIDER-120772

(cherry picked from commit c0ce5cc65b673ae84f1261455a807b820c8824b3)

IJ-CR-150848

GitOrigin-RevId: fc14e3f3d88caf797934884919cd2274a188c7a4

platform/core-api/src/com/intellij/ide/plugins/DynamicPluginVetoer.kt

@@ -1,6 +1,7 @@
 // Copyright 2000-2024 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
 package com.intellij.ide.plugins
 
+import org.jetbrains.annotations.ApiStatus
 import org.jetbrains.annotations.Nls
 
 interface DynamicPluginVetoer {
@@ -13,5 +14,9 @@ interface DynamicPluginVetoer {
    *         'null' to let the plugin be unloaded
    */
   fun vetoPluginUnload(pluginDescriptor: IdeaPluginDescriptor): @Nls String?
+
+
+  @ApiStatus.Internal
+  fun vetoPluginLoad(pluginDescriptor: IdeaPluginDescriptor): Boolean = false
 }
 

platform/platform-impl/src/com/intellij/ide/plugins/DynamicPlugins.kt

@@ -880,6 +880,15 @@ object DynamicPlugins {
 
   private fun doLoadPlugin(pluginDescriptor: IdeaPluginDescriptorImpl, project: Project? = null): Boolean {
     var result = false
+
+    val isVetoed = VETOER_EP_NAME.findFirstSafe {
+      it.vetoPluginLoad(pluginDescriptor)
+    } != null
+
+    if (isVetoed) {
+      return false
+    }
+
     val indicator = PotemkinProgress(IdeBundle.message("plugins.progress.loading.plugin.title", pluginDescriptor.name),
                                      project,
                                      null,