fix(Expo): SDK55 Android build failure in MainApplication patch

[floydkim]

Background

Android builds for Expo SDK55 could fail because the generated MainApplication.kt sometimes had invalid comma placement after plugin patching.

Root cause

The Expo plugin logic that injects jsBundleFilePath did not consistently normalize trailing commas around the packageList argument block, which could produce invalid Kotlin syntax for certain template shapes.

Changes

• Expanded the packageList matching pattern to handle cases with/without an existing jsBundleFilePath line.
• Normalized trailing comma handling before injecting jsBundleFilePath.
• Added test assertion to verify comma normalization and prevent regressions.