Uninstalling module should have option to clear settings

I had v2.11 of this module installed. I uninstalled it thinking it would help get me out of a weird config state. After I ran `zpm uninstall git-source-control`, I noticed that data set up by the module in `^SYS("SourceControl","Git")` was still hanging around.

users should at least be given the option to clear out this (and any other?) config data when uninstalling this module.

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Module v2.11.0
$zv: IRIS for Windows (x86-64) 2023.1.5 (Build 697U) Thu Oct 3 2024 13:47:51 EDT

Start by locating the uninstall path invoked by `zpm uninstall git-source-control` and trace how the module’s data in `^SYS("SourceControl","Git")` is created and retained. Done means uninstalling offers a choice to clear the module’s configuration, with the selected behavior verified for both retaining and removing that data.

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