test(e2e): De-flake TurboModule span-attribute count assertion (#6596)

* test(e2e): Fix TurboModule flow viewport on Android emulator

The `turbo_module.*` attribute block is the last content in a long
ScrollView, so on the shorter Android emulator screen it renders below the
fold. `assertVisible` only inspects the current viewport, so the
`turbo_module.total_call_count: 6` assertion has failed on every Android
REV2 run since #6549 introduced the test, while iOS (taller screen, block
in view) has been green — proving the SDK and on-device render are correct.

- Scroll the attribute block into view before asserting, and match the full
  line with a regex (Maestro anchors `assertVisible` text to the whole node,
  so a bare `total_call_count:` prefix would not match `... : 6`).
- Run the native-throw interaction before that scroll: the throw button is
  at the top of the screen and must be tapped while the viewport is still
  there, otherwise scrolling to the attributes pushes it off-screen on
  Android.

The exact on-screen count is intentionally not pinned — it can race the
async `getPlatform` record settling against the synchronous post-`end()`
read; the authoritative counts are asserted against the transaction
envelope in turboModuleSpanAttributes.test.ts.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* Remove uneeded comment

* Simplify test comment

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: antonis

samples/react-native/e2e/tests/turboModuleSpanAttributes/turboModuleSpanAttributes.test.yml

@@ -30,13 +30,22 @@ appId: io.sentry.reactnative.sample
 - assertVisible: 'Sync: add x5 = 15'
 - assertVisible: 'Async: getPlatform = .*'
 
-# The `turbo_module.*` attributes the TurboModuleContext integration attached
-# to the root span are rendered on screen so QA can eyeball them on device.
-- assertVisible: 'turbo_module.total_call_count: 6'
-- assertVisible: 'turbo_module.total_error_count: 0'
-
-# A native throw surfaced to JS must still be capturable (crash-context path)
 - tapOn: 'Throw from native platform'
 - extendedWaitUntil:
     visible: 'Throw: captured platform throw as .*'
     timeout: 30000
+
+# The `turbo_module.*` attributes the TurboModuleContext integration attached
+# to the root span are rendered on screen. Scroll it into view before asserting.
+# The exact aggregate counts are asserted against the transaction envelope
+# in turboModuleSpanAttributes.test.ts, which is the authoritative source.
+- scrollUntilVisible:
+    element:
+      text: 'turbo_module.total_call_count: .*'
+    direction: DOWN
+    timeout: 10000
+- scrollUntilVisible:
+    element:
+      text: 'turbo_module.total_error_count: 0'
+    direction: DOWN
+    timeout: 10000