I don't think the list of plugins used by a build will really satisfy your request. There are very useful plugins which are not used by any build.
The thin backup plugin and the configuration slicing plugin are two plugins which are examples of plugins that are likely not referenced in a job, yet are quite useful in a Jenkins server.
My preference has been to copy the names of the hpi and jpi files in the plugins directory and use them as the definition of the relevant plugins. A plugin which is not executed is quite low risk, while missing a plugin that you need can cause many problems.
Mark Waite
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