[maven][IDEA-384417] do not init maven under read lock

GitOrigin-RevId: ca2ab27eebef4a75c60e0aeb5b90375029680c96

plugins/maven/src/main/java/org/jetbrains/idea/maven/project/MavenProjectsManager.java

@@ -281,6 +281,7 @@ public abstract class MavenProjectsManager extends MavenSimpleProjectComponent
     }
   }
 
+  @RequiresReadLockAbsence
   private void initProjectsTree() {
     if (projectsTreeInitialized.get()) return;
     initLock.lock();