You can't. Any add-on will provide a set of functions that could be used anywhere. Some may be limited to projects, some are identifiable by saved data (a custom field will, well, exist on the list. A post-function will be referred to in workflows, etc)
But there's no way of knowing where something like the CLI connector might have been used - it can be used to do things that don't store any data you can even begin to search for.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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