Disable Settings large-screen optimization

Disable the optimization that is automatically enabled when
including Window Extensions through Activity Embedding.
The optimization causes to launch an additional trampoline
activity for deep links, even when the screen size is smaller
than required by Activity Embedding rules.

This CL also rename isActivityEmbeddingEnabled to
shouldEnableLargeScreenOptimization because the method
may report false even if the device supports the feature
but Settings app doesn't for performance concern.

Bug: 267725145
Bug: 279461170

Test: Build, perf metrics
Test: atest LauncherIronwoodIntegrationTests:android.platform.test.scenario.launcher.integration_tests.HomescreenCustomizationTests
Test: atest SettingsMultiPaneDeepLinkTest.java
Change-Id: I38e8c62a61a344eb7a5cbfd1cd2c2137357d1a87