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AFAIK, `AndroidComponentsExtension` is different from extension with name `"android"` that will return `BaseExtension`

And `beforeVariants` is only available in `AndroidComponentsExtension`

After looking into an old PR I noticed that “android” extension is probably replaced by “androidComponents”

PR: <https://github.com/android/gradle-recipes/pull/8/files#diff-b166043dd30e6674eaf7a49f91e00ef5411d9d08f5b9c8dd1fd2b2361a102971L11>

Here is an example on how to access beforeVariants / onVariants :
```val extension = project.extensions.getByName("androidComponents") as ApplicationAndroidComponentsExtension

extension.beforeVariants {}```
Ref: <https://github.com/android/gradle-recipes/blob/agp-7.0/BuildSrc/testVariantFilteringOnBuildType/buildSrc/src/main/kotlin/CustomPlugin.kt>