feat(core): Respect Mask boundaries when reading sentry-label for touch breadcrumbs (#6142)

Skip sentry-label when maskAllText is enabled or the touched element is
inside a RNSentryReplayMask ancestor, preventing masked text content from
leaking into breadcrumbs. Fallback labels (accessibilityLabel, testID)
still work. Also skips text extraction from children inside Mask ancestors.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>