Migrated platform channel test interface

[florissmit1]

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

Migration

⤵️ What is the current behavior?

Currently the tests are failing due to breaking changes to the platform channel test interface

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

The platform channel test interface is migrated

💥 Does this PR introduce a breaking change?

Yes. Currently the changes are present in the flutter master channel, so this PR should be merged when the changes are also available on the flutter stable channel.

🐛 Recommendations for testing

Does not apply

📝 Links to relevant issues/docs

Does not apply

🤔 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

Merging #770 (0f4510b) into master (46d0df2) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            master      #770    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files            1        17    +16     
  Lines           27       242   +215     
==========================================
+ Hits            27       242   +215     

Impacted Files	Coverage Δ
geolocator/lib/geolocator.dart
...rs/permission_definitions_not_found_exception.dart	100.00% <0.00%> (ø)
...orm_interface/lib/src/models/location_options.dart	100.00% <0.00%> (ø)
...orm_interface/lib/src/enums/location_accuracy.dart	100.00% <0.00%> (ø)
...ce/lib/src/errors/permission_denied_exception.dart	100.00% <0.00%> (ø)
...rors/permission_request_in_progress_exception.dart	100.00% <0.00%> (ø)
...face/lib/src/errors/position_update_exception.dart	100.00% <0.00%> (ø)
...src/implementations/method_channel_geolocator.dart	100.00% <0.00%> (ø)
...terface/lib/src/geolocator_platform_interface.dart	100.00% <0.00%> (ø)
...or_platform_interface/lib/src/models/position.dart	100.00% <0.00%> (ø)
... and 8 more

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[mvanbeusekom]

The change looks good, but we cannot merge it since the required update of the flutter_test package is not released to stable yet (note that the flutter_test package is integrated into the Flutter framework).