Android location stream not cancelling

[Wackymax]

✨ What kind of change does this PR introduce? (Bug fix, feature, docs update...)

Bug fix

⤵️ What is the current behavior?

Currently when the location stream is cancelled the geolocator background service does not fully shutdown correctly.

🆕 What is the new behavior (if this is a feature change)?

This fixes the check for when multiple flutter engines are connected and location stream is explicitly being cancelled by the user instead of being cancelled by the activity process getting destroyed.

💥 Does this PR introduce a breaking change?

No

🐛 Recommendations for testing

1. Set the Android foreground config. Start the location stream and shortly after stop it. The foreground notification should be removed when the service shuts down.
2. When using a background service like flutter_background_service and starting the geolocator stream in the background service and then killing the main activity should not stop the geolocator service and it should continue to send position updates to the background service

📝 Links to relevant issues/docs

#1142
#986

🤔 Checklist before submitting

• I made sure all projects build.
• I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy.
• I updated CHANGELOG.md to add a description of the change.
• I followed the style guide lines (code style guide).
• I updated the relevant documentation.
• I rebased onto current master.

[codecov]

Codecov Report

Base: 100.00% // Head: 98.29% // Decreases project coverage by -1.70% ⚠️

Coverage data is based on head (bff0d44) compared to base (85b45ff).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##              main    #1153      +/-   ##
===========================================
- Coverage   100.00%   98.29%   -1.71%     
===========================================
  Files           13        3      -10     
  Lines          236      117     -119     
===========================================
- Hits           236      115     -121     
- Misses           0        2       +2     

Impacted Files	Coverage Δ
...ocator_android/lib/src/types/android_settings.dart	100.00% <ø> (ø)
...or_platform_interface/lib/src/models/position.dart
...terface/lib/src/extensions/integer_extensions.dart
...e/lib/src/errors/already_subscribed_exception.dart
...rm_interface/lib/src/models/location_settings.dart
...rors/permission_request_in_progress_exception.dart
...terface/lib/src/geolocator_platform_interface.dart
...ce/lib/src/errors/permission_denied_exception.dart
...src/implementations/method_channel_geolocator.dart
...face/lib/src/errors/position_update_exception.dart
... and 7 more

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[Wackymax]

@mvanbeusekom I didn't make changes to the dart code so not sure what the codecov is complaining about?

[mvanbeusekom]

LGTM, thanks for fixing this @Wackymax