Add (empty) function to remediate a precondition error of a plugin

[jonesbusy]

Relate to https://github.com/jenkinsci/plugin-modernizer-tool/pull/307/files

But without using any transformation

@gounthar Perpaps you can "cherry-pick" code of the PomModifier using of each precondition error remediate function ?

For the moment we don't have tests for the PluginModernizer class but I've tested the function is called with the vagrant plugin for example. Right now all function return false because nothing is done. I left TODOs in the code

Testing done

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[gounthar]

Thanks, I will try to base my work on this. 👍