Adapters fail to recognise GradleEnterpriseExtension prior to version 3.11

[bigdaz]

Due to the way the extension is inspected for implemented interfaces, the adapters library will fail to recognise a GradleEnterpriseExtension from plugin versions prior to 3.11.

The failure appears as:

* What went wrong:
An exception occurred applying plugin request [id: 'com.gradle.common-custom-user-data-gradle-plugin', version: '2.0.2']
> Failed to apply plugin 'com.gradle.common-custom-user-data-gradle-plugin'.
   > The supplied object of type 'com.gradle.enterprise.gradleplugin.internal.extension.DelegatingGradleEnterpriseExtension_Decorated' is not a Gradle Enterprise extension object

This can be addressed by inspecting the interfaces implemented by all superclasses of the extension type, instead of assuming a particular class structure.