plugin manager doesn't follow standard naming pattern, so isn't detected

Problem/Motivation

Plugin manager services in core and contrib follow the naming pattern 'plugin.manager.foo'.

e.g.

  plugin.manager.filter:
    class: Drupal\filter\FilterPluginManager
    parent: default_plugin_manager

The plugin manager service here is called localgov_waste_collection.data_provider_manager.

This means that modules like Plugin and Module Builder don't detect it.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes