chore: prefer executablePath for page.pause() (#31985)

Motivation: For scenarios where
[`findChromiumChannel`](f17de8222f/packages/playwright-core/src/server/registry/index.ts (L1016))
throws (no branded browser and no normal browser is installed) we were
[silently
catching](f17de8222f/packages/playwright-core/src/server/recorder.ts (L79))
when calling `page.pause()`.

This patch does not invoke `findChromiumChannel` when the
inspectedContext is Chromium based and has an `executablePath`
specified.

Note this was already fixed by #6214, but regressed since then.

Fixes https://github.com/microsoft/playwright/issues/31967

packages/playwright-core/src/server/launchApp.ts

@@ -43,7 +43,7 @@ export async function launchApp(browserType: BrowserType, options: {
   }
 
   const context = await browserType.launchPersistentContext(serverSideCallMetadata(), '', {
-    channel: findChromiumChannel(options.sdkLanguage),
+    channel: !options.persistentContextOptions?.executablePath ? findChromiumChannel(options.sdkLanguage) : undefined,
     noDefaultViewport: true,
     ignoreDefaultArgs: ['--enable-automation'],
     colorScheme: 'no-override',

packages/playwright-core/src/server/recorder/recorderApp.ts

@@ -127,6 +127,7 @@ export class RecorderApp extends EventEmitter implements IRecorderApp {
         useWebSocket: !!process.env.PWTEST_RECORDER_PORT,
         handleSIGINT,
         args: process.env.PWTEST_RECORDER_PORT ? [`--remote-debugging-port=${process.env.PWTEST_RECORDER_PORT}`] : [],
+        executablePath: inspectedContext._browser.options.isChromium ? inspectedContext._browser.options.customExecutablePath : undefined,
       }
     });
     const controller = new ProgressController(serverSideCallMetadata(), context._browser);