fix(profiling-node): Send profile chunks with client.sendEnvelope (#24896)

The continuous profiler sent `profile_chunk` envelopes straight to the
transport, so the `beforeEnvelope` hook never ran for them. It now uses
`client.sendEnvelope()`, as the browser `UIProfiler` does.

- Ref. getsentry/sentry-electron#1445

Author: timfish

packages/profiling-node/src/integration.ts

@@ -275,18 +275,12 @@ class ContinuousProfiler {
       return;
     }
 
-    const transport = this._client.getTransport();
-    if (!transport) {
-      DEBUG_BUILD && debug.log('[Profiling] No transport available to send profile chunk.');
-      return;
-    }
-
     const dsn = this._client.getDsn();
     const metadata = this._client.getSdkMetadata();
     const tunnel = this._client.getOptions().tunnel;
 
     const envelope = makeProfileChunkEnvelope('node', chunk, metadata?.sdk, tunnel, dsn);
-    transport.send(envelope).then(null, reason => {
+    this._client.sendEnvelope(envelope).then(null, reason => {
       DEBUG_BUILD && debug.error('Error while sending profile chunk envelope:', reason);
     });
   }

packages/profiling-node/test/integration.test.ts

@@ -145,6 +145,32 @@ describe('ProfilingIntegration', () => {
           }),
         });
       });
+
+      it('emits the `beforeEnvelope` hook for profile chunks', async () => {
+        const [client, transport] = makeSpanProfilingClient({
+          profileLifecycle: 'manual',
+          profileSessionSampleRate: 1,
+        });
+
+        Sentry.setCurrentClient(client);
+        client.init();
+
+        vi.spyOn(transport, 'send').mockReturnValue(Promise.resolve({}));
+
+        const beforeEnvelope = vi.fn();
+        client.on('beforeEnvelope', beforeEnvelope);
+
+        Sentry.profiler.startProfiler();
+        await wait(1000);
+        Sentry.profiler.stopProfiler();
+
+        await Sentry.flush(1000);
+
+        expect(beforeEnvelope).toHaveBeenCalledTimes(1);
+        expect(beforeEnvelope.mock.calls[0]?.[0]?.[1]?.[0]?.[0]).toMatchObject({
+          type: 'profile_chunk',
+        });
+      });
     });
   });