Fixes #6103: Improved codeception config in app templates to ease testing of advanced app on multiple hosts

Fixes #4277: `yii\grid\GridView` is no longer throwing an exception in non-debug mode when results are empty and `columns` aren't defined

Fixes #5627: Added `yii cache/flush-schema` console command to flush DB schema cache of a given database connection

Fixes #6271: Query caching returns the same data when running the same SQL with different fetch modes

Update guides

Fixes #6236: No JS scripts should be registered when `yii\widgets\ActiveForm::enableClientScript` is false

docs/guide/structure-applications.md - fixed link reference

docs/guide-ja/* updated following the changes in docs/guide/* [ci skip]

[ci skip] Update tutorial-advanced-app.md

`..init --env=Production overwrite=All` dont not work on interactive mode but `init --env=Production --overwrite=All` works fine.

[ci skip] docs/guide-pt-BR/structure-applications.md - typo/fixed

[WIP] first draft of a fix for #5448

fixes #5448