[Android][Permissions]Requesting permissions using RequestAsync while the app is in the background - fix

[kubaflo]

Description of Change

This check is necessary because in Android, OnRequestPermissionsResult can be called with an empty grantResults array if the user interaction was interrupted. Ignoring this could lead to incorrect assumptions that permissions were granted.

Issues Fixed

Fixes #30678

[dotnet-policy-service]

Hey there @@kubaflo! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[Copilot]

Pull Request Overview

This PR fixes a critical bug in Android permissions handling where interrupted user interactions could lead to incorrect permission grant assumptions. The change adds a necessary check to handle empty grant results arrays that can occur when permission requests are interrupted (e.g., when the app goes to background).

• Adds validation for empty grantResults array in permission request handling
• Ensures interrupted permission requests are properly treated as denied rather than incorrectly assumed as granted

Comments suppressed due to low confidence (1)

src/Essentials/src/Permissions/Permissions.android.cs:89

• This critical security fix that handles interrupted permission requests should have corresponding test cases to verify the behavior when grantResults is empty. Please ensure test cases exist in TestCases.HostApp and TestCases.Shared.Tests to validate this edge case.

				if (permissionResult.GrantResults.Length == 0 || permissionResult.GrantResults.Any(g => g == Permission.Denied))