example(android): show default source image example

[hannojg]

Summary:

This enables the Image defaultSource prop example for android.

In debug builds we have to use a bundled image, as we just try to resolve it from the app's resources:

react-native/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/image/ReactImageView.kt

Lines 339 to 340 in c12806c

	public fun setDefaultSource(name: String?) {
	val newDefaultDrawable = ResourceDrawableIdHelper.getResourceDrawable(context, name)

The rational for this one is that i am experiencing a bug with defaultSource on android and this example is helping in the following PRs:

• fix(android): Image defaultSource & loadingIndicatorSrc broken with props 2.0 #55210

Changelog:

[Internal] - RNTester app android enable Image defaultSource prop example

Test Plan:

Tested in tester app.

Debug:

Screen.Recording.2026-01-19.at.18.41.58.mov

Release:

Screen.Recording.2026-01-19.at.18.48.03.mov

[meta-codesync]

@cortinico has imported this pull request. If you are a Meta employee, you can view this in D91027357.