Undocumented mandatory use for `android:flavorizrGradle` with `android:buildGradle` together

[oleksandrtilnyi-plentific]

Description

Environment

Flutter v3.27.1
flutter_flavorizr v2.4.0

Issue

I've been using custom set of instructions and it seems, that introducing flavorizr.gradle file via android:flavorizrGradle totally removed support for usual android:buildGradle instruction. Lines for importing flavorizr.gradle are added even if there's no android:flavorizrGradle defined in the list of instructions.

// ----- BEGIN flavorDimensions (autogenerated by flutter_flavorizr) -----
apply from: "flavorizr.gradle"
// ----- END flavorDimensions (autogenerated by flutter_flavorizr) -----

This makes build.gradle referenced to the file which is not being generated

Steps to reproduce

• Define the flavorizr.yaml file with instructions which do not contain android:flavorizrGradle processor
• Run dart run flutter_flavorizr
• Observe adding reference to the file, while it's not being under android/app directory

Fix

Just adding an instruction android:flavorizrGradle fixes the issue.

So maybe this should be documented in the table of possible instructions, that android:flavorizrGradle and android:buildGradle must be used together.