Fix native e2e device tests (#34715)

Increase the accuracy of the swipe distance required to scroll one page
of blocks within the block inserter. We now have more than two pages of
blocks. The previous implementation would scroll too far (to the
bottom), which caused failures when the test scrolled _past_ the subject
block.

packages/react-native-editor/__device-tests__/pages/editor-page.js

@@ -292,6 +292,11 @@ class EditorPage {
 		}
 	}
 
+	static getInserterPageHeight( screenHeight ) {
+		// Rough estimate of a swipe distance required to scroll one page of blocks
+		return screenHeight * 0.82;
+	}
+
 	// Attempts to find the given block button in the block inserter control.
 	async findBlockButton( blockName ) {
 		const blockAccessibilityLabel = `${ blockName } block`;
@@ -308,7 +313,7 @@ class EditorPage {
 				swipeFromTo(
 					this.driver,
 					{ x, y: size.height - 100 },
-					{ x, y: size.height - 450 }
+					{ x, y: EditorPage.getInserterPageHeight( size.height ) }
 				);
 			}
 
@@ -330,7 +335,7 @@ class EditorPage {
 				fromX: 50,
 				fromY: height,
 				toX: 50,
-				toY: height - 450,
+				toY: EditorPage.getInserterPageHeight( height ),
 				duration: 0.5,
 			} );
 		}