feat(browser)!: Extract interaction spans into new interactionsIntegration (#23295)

## What
This extracts interaction spans into a new opt-in (standalone)
`interactionsIntegration`.

```js
// before
Sentry.browserTracingIntegration({ _experiments: { enableInteractions: true } });

// after
[Sentry.browserTracingIntegration(), Sentry.interactionsIntegration()];
```
## Why

Interaction idle spans have been experimental since v7. We don't expect
to promote them to stable, but they still cost bundle size for every
user of `browserTracingIntegration`.

closes #22353

---------

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: 2 people

dev-packages/browser-integration-tests/suites/tracing/browserTracingIntegration/interactions-streamed/init.js

@@ -1,12 +1,10 @@
 import * as Sentry from '@sentry/browser';
+import { interactionsIntegration } from '@sentry/browser';
 
 window.Sentry = Sentry;
 
 Sentry.init({
   dsn: 'https://public@dsn.ingest.sentry.io/1337',
   tracesSampleRate: 1,
-  integrations: [
-    Sentry.browserTracingIntegration({ _experiments: { enableInteractions: true } }),
-    Sentry.spanStreamingIntegration(),
-  ],
+  integrations: [Sentry.browserTracingIntegration(), interactionsIntegration(), Sentry.spanStreamingIntegration()],
 });

dev-packages/browser-integration-tests/suites/tracing/browserTracingIntegration/interactions-streamed/template.html

@@ -1,10 +1,11 @@
 import * as Sentry from '@sentry/browser';
+import { interactionsIntegration } from '@sentry/browser';
 
 window.Sentry = Sentry;
 
 Sentry.init({
   traceLifecycle: 'static',
   dsn: 'https://public@dsn.ingest.sentry.io/1337',
   tracesSampleRate: 1,
-  integrations: [Sentry.browserTracingIntegration({ _experiments: { enableInteractions: true } })],
+  integrations: [Sentry.browserTracingIntegration(), interactionsIntegration()],
 });

dev-packages/browser-integration-tests/suites/tracing/browserTracingIntegration/interactions/subject.js

@@ -1,4 +1,5 @@
 import * as Sentry from '@sentry/browser';
+import { interactionsIntegration } from '@sentry/browser';
 
 window.Sentry = Sentry;
 
@@ -7,10 +8,8 @@ Sentry.init({
   integrations: [
     Sentry.browserTracingIntegration({
       enableLongTask: false,
-      _experiments: {
-        enableInteractions: true,
-      },
     }),
+    interactionsIntegration(),
     Sentry.spanStreamingIntegration(),
     Sentry.spotlightBrowserIntegration(),
   ],

dev-packages/browser-integration-tests/suites/tracing/browserTracingIntegration/interactions/template.html

@@ -1,4 +1,5 @@
 import * as Sentry from '@sentry/browser';
+import { interactionsIntegration } from '@sentry/browser';
 
 window.Sentry = Sentry;
 
@@ -8,10 +9,8 @@ Sentry.init({
   integrations: [
     Sentry.browserTracingIntegration({
       enableLongTask: false,
-      _experiments: {
-        enableInteractions: true,
-      },
     }),
+    interactionsIntegration(),
     Sentry.spotlightBrowserIntegration(),
   ],
   tracesSampleRate: 1,

dev-packages/browser-integration-tests/suites/tracing/browserTracingIntegration/interactions/test.ts

@@ -5,10 +5,6 @@ window.Sentry = Sentry;
 Sentry.init({
   traceLifecycle: 'static',
   dsn: 'https://public@dsn.ingest.sentry.io/1337',
+  integrations: [Sentry.browserTracingIntegration()],
   tracesSampleRate: 1,
-  integrations: [
-    Sentry.browserTracingIntegration({
-      _experiments: { enableInteractions: true },
-    }),
-  ],
 });