Check LocationSettingsResponse success before processing

[andannn]

First check if the LocationSettingsResponse task was successful before attempting to get the result.

Fix FusedLocationClient.isLocationServiceEnabled crashes.

List at least one fixed issue. https://github.com/Baseflow/flutter-geolocator/issues/1366 https://github.com/Baseflow/flutter-geolocator/issues/1527

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• [x] I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy, or this PR is does not need version changes.
• [x] I updated CHANGELOG.md to add a description of the change.
• [ ] I updated/added relevant documentation (doc comments with ///).
• [x] I rebased onto main.
• [ ] I added new tests to check the change I am making, or this PR does not need tests.
• [x] I made sure all existing and new tests are passing.
• [x] I ran dart format . and committed any changes.
• [x] I ran flutter analyze and fixed any errors.