[CMake] Allow flexible user plugin install location #7547
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Create a cache variable of the same name as the previous normal variable that users can set to a specific path for user plugin installation destination.
This is primarily to help with CI builds to make it easier to find where the final plugin is located before uploading as a release.
NOTE: I wasn't sure the best way to handle the duplicate variables, so I just modified both locations in the same way. The effect of setting the
BN_USER_PLUGINS_DIRcache variable multiple times shouldn't be an issue, but I'm happy to change it to something better if you have some suggestions. In fact, withBN_USER_PLUGINS_DIRas a cache variable, we could remove the duplication in thebn_install_pluginfunction.