we have the following add-ons installed in JIRA Core:
That's pretty much an essay question, and not an easy one.
There is no simple way to ask "where is an add-on used" because add-ons can inject themselves into all sorts of places and you might never find them all. Especially ones that provide a swathe of functions - the classic one is the JIRA Toolkit, where you'd need to look at fields in use, workflows, and then, um, if you turn it off, you may hear users yelling that an issue tab has vanished.
However, you've picked on two of the slightly easier ones. If you have an xml backup of your system, you can search it for part of the keys of the add-ons, because workflow functions say "in this transition, run class <key.workflow-function>"
Clumsy and inelegant, but it's currently the only quick way to find add-on usage.
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