fix(rtn-push-notification): android build/rn 0.81.4 compatibility

[osama-rizk]

Description of changes

This PR fixes Android build compilation errors in the rtn-push-notification package that were preventing successful builds on React Native 0.81.4 and newer versions.

Key fixes:

• Fixed onActivityResult method signature to match the required interface parameters (activity, requestCode, resultCode, data instead of generic p0, p1, p2, p3)
• Replaced deprecated currentActivity property usage with proper reactApplicationContext.getCurrentActivity() calls
• Added null safety checks when accessing the current activity to prevent potential crashes

Issue #, if available

Fixes #14594

Description of how you validated changes

• All existing unit tests pass (12 test suites, 28 tests)

Checklist

• PR description included
• yarn test passes
• Unit Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)

Checklist for repo maintainers

• Verify E2E tests for existing workflows are working as expected or add E2E tests for newly added workflows
• New source file paths included in this PR have been added to CODEOWNERS, if appropriate

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.