[clsi-cache] check compiler settings before using compile from cache (#24845)

* [web] provide an actual rootFolder from EditorProviders in tests

- Fixup SocketIOMock and ShareJS mocks to provide the complete interface
- Extend SocketIOMock interface to count event listeners
- Fixup test that did not expect to find a working rootDoc

* [web] expose imageName from ProjectContext

* [clsi-cache] check compiler settings before using compile from cache

* [web] avoid fetching initial compile from clsi-cache in PDF detach tab

GitOrigin-RevId: e3c754a7ceca55f03a317e1bc8ae45ed12cc2f02

services/web/frontend/js/ide/connection/SocketIoShim.js

@@ -277,13 +277,34 @@ if (typeof io === 'undefined' || !io) {
   current = SocketShimV2
 }
 
-export class SocketIOMock extends EventEmitter {
+export class SocketIOMock extends SocketShimBase {
+  constructor() {
+    super(new EventEmitter())
+    this.socket = {
+      get connected() {
+        return false
+      },
+      get sessionid() {
+        return undefined
+      },
+      get transport() {
+        return {}
+      },
+      get transports() {
+        return []
+      },
+
+      connect() {},
+      disconnect(reason) {},
+    }
+  }
+
   addListener(event, listener) {
-    this.on(event, listener)
+    this._socket.on(event, listener)
   }
 
   removeListener(event, listener) {
-    this.off(event, listener)
+    this._socket.off(event, listener)
   }
 
   disconnect() {
@@ -294,6 +315,10 @@ export class SocketIOMock extends EventEmitter {
     // Round-trip through JSON.parse/stringify to simulate (de-)serializing on network layer.
     this.emit(...JSON.parse(JSON.stringify(args)))
   }
+
+  countEventListeners(event) {
+    return this._socket.events[event].length
+  }
 }
 
 export default {