[google_map_flutter] Fix map object regression due to async changes (#4171)

In #4067 I changed several implicitly unawaited futures to `await`, not noticing that doing so would change the timing on updating fields that were used to compute diffs for future updates. Since the update flow is unawaited at higher levels, this meant that multiple calls to update map objects in rapid succession would compute incorrect diffs due to using the wrong base objects. This fixes that by restoring the old flow using `unawaited`.

Adds new tests that introduce synthetic awaits into the fake platform interface object and perform multiple updates in a row that should have different base object sets, which fail without the fix.

In order to simplify adding that behavior to the fake, and to pay down technical debt in the unit tests, I replaced the old test fake that is based on method channel interception (which predates the federation of the plugin and is implicitly relying on the method channel implementation from a different package never changing) with a fake platform interface implementation (substantially simplifying the fake).

Fixes https://github.com/flutter/flutter/issues/128042
13 files changed
tree: 8847f836ac78ca132ea1ccb7a26b91ced3070dd4
  1. .ci/
  2. .github/
  3. packages/
  4. script/
  5. third_party/
  6. .ci.yaml
  7. .cirrus.yml
  8. .clang-format
  9. .gitattributes
  10. .gitignore
  11. .gitmodules
  12. .metadata
  13. analysis_options.yaml
  14. AUTHORS
  15. CODEOWNERS
  16. CONTRIBUTING.md
  17. customer_testing.bat
  18. customer_testing.sh
  19. LICENSE
  20. README.md
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