Remove unused code (#6018)

Author: martinbonnin

benchmark/app/debug/app-debug.apk

@@ -1,17 +1,9 @@
-# Compiler hooks examples
+# Apollo Compiler plugin integration tests
 
-In this project you can see examples of how to use the compiler hooks.
+Examples of how to use the `ApolloCompilerPlugin` API.
 
-A few example implementations of `ApolloCompilerKotlinHooks` are defined in `build.gradle.kts`:
-
-- `DefaultNullValuesHooks` - Adds a default `null` value to data class fields that are nullable
-- `TypeNameInterfaceHooks` - Adds a super interface to models that expose `__typename`
-- `PrefixNamesKotlinHooks` / `PrefixNamesJavaHooks` - Prefix generated class names with the specified prefix. Shows how
-  to make `postProcessFileSpec` and `overrideResolvedType` work together.
-- `CapitalizeEnumValuesHooks` - Capitalize generated enum values
-- `AddGettersAndSettersHooks` - Add getters and setters to the models
-
-## Gradle plugin
-
-To use `compilerKotlinHooks` you must use `id("com.apollographql.apollo3.external")` instead of the
-usual `id("com.apollographql.apollo3")`. This is because the external plugin doesn't relocate the KotlinPoet dependency that the hooks api depends on.
+- `default-null-values` - Adds a default `null` value to data class fields that are nullable
+- `typename-interface` - Adds a super interface to models that expose `__typename`
+- `prefix-names` / `PrefixNamesJavaHooks` - Prefix generated class names with the specified prefix. 
+- `capitalize-enum-values` - Capitalize generated enum values
+- `getters-and-setters` - Add getters and setters to the models