reads min/target sdk versions from localproperties

[brunotacca]

This PR changes the build.gradle files to read the flutter.minSdkVersion and flutter.targetSdkVersion from the generated local.properties, and if not found, keep the default one (which is set at flutter.gradle)

It changes all build.gradle files from examples/* and the integration_test/example.
It doesn't change build.gradle files from dev projects at dev/* but they can be changed too upon further request.
It changes both java and kotlin build.gradle templates.
It changes the default app test to expect the new strings on build.gradle.
It doesn't apply the same concept to flutter.compileSdkVersion, so having it on local.properties doesn't change the value set at flutter.gradle, this can also be added upon further request.

This PR also changes flutter.gradle to detect and warn the developer with a logger.quiet message about mismatches with plugins API level. If a mismatch is found, it also checks if the variables flutter.minSdkVersion and flutter.targetSdkVersion were set at local.properties

It also changes the gradle_errors.dart to update the box message about how to fix the API level error, while adding a reference to the docs. The test was also updated.

Images:

[Before] New project with a dependency requiring higher sdk version.

[After] New project with a dependency requiring higher sdk version.

[After] New project with the variables INcorrectly set at local.properties.

[After] New project with the variables correctly set at local.properties.

It closes #95533
Partially solves #95485 (Android part)
Could be a solution to #95514

Extra - Not related: at 0440790 I fixed the command required to export the FLUTTER_ROOT variable in order to run tests.

[camsim99]

To be consistent with #95684

[tatsuyuki25]

How to set this properties on CI server? the local.properties in .gitignore, no upload to git repository.

[brunotacca]

PTAL @christopherfujino

[fluttergithubbot]

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[christopherfujino]

LGTM

[SPiercer]

quick question do i just add the values in the local.properties ?

flutter.buildMode=debug
flutter.versionName=1.0.0
flutter.versionCode=1
flutter.minSdkVersion=19
flutter.targetSdkVersion=31
flutter.compileSdkVersion=33

like so or i'm missing something ?

[camsim99]

@SPiercer Looks like this change was reverted in #99191. You can update the minSdkVersion and targetSdkVersion directly in the build.gradle configuration file located at [your project]/android/app . For more information, see https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.