AST Controller transforms should be driven by annotation not name

### Issue description

From the weekly & https://github.com/apache/grails-core/pull/15669/files#r3343449311 : AST Controller transforms should be driven by annotation not name

Start by reading the discussion and changed files in pull request 15669, focusing on the AST Controller transforms. Determine which transforms currently rely on controller names and define the annotation-driven behavior expected by the issue. Done means the transforms use annotations rather than names, with relevant tests updated or added.

Written by the indexing model from the issue text.