fix: MAUI - drop OTel activity instrumentation dependency

[abelonogov-ld]

Summary

• Remove io.opentelemetry.android.instrumentation:activity:0.11.0-alpha (both implementation and copyDependencies) from the MAUI native Android module (LDObserve/build.gradle.kts), so the activity instrumentation AAR is no longer copied into the shipped NuGet deps.
• Fix ObservabilityBridge, which still passed activityLifecycle = true to Instrumentations(...) — a parameter removed in feat: Android track API and productAnalytics options #577 (renamed to analytics.pageViews). This was a stale reference that no longer compiles against the current observability-android lib.
• Since page views rely on the activity instrumentation AAR we no longer ship, explicitly set analytics.pageViews = false so the SDK calls suppressInstrumentation("activity") instead of relying on the instrumentation just being silently absent.

Notes

• instrumentations.screens / userTaps are left at their defaults (true): screen detection and Session Replay navigation use Android's own registerActivityLifecycleCallbacks, not the OTel activity AAR, so they keep working.
• observability-android/lib still declares the activity dependency (shared with Flutter); at runtime on MAUI the AAR simply won't be on the classpath and the suppressed instrumentation stays off.

Test plan

• MAUI native Android Gradle module compiles (ObservabilityBridge no longer references the removed activityLifecycle param).
• Verify the activity instrumentation AAR is absent from outputs/deps / the produced NuGet.
• Smoke test a MAUI sample app: crash reporting + launch time + session replay navigation still function; no page-view spans emitted.

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