Plugins: env not completely removed when removing

[dcdenu4]

I'm seeing:

 WARNING conda.gateways.disk.delete:unlink_or_rename_to_trash(182): Could not remove or rename C:\Users\ddenu\miniforge3\envs\invest_plugin_schistosomiasis\Library\share\proj\proj.db.  Please remove this file manually (you may need to reboot to free file handles)
[1] WARNING conda.gateways.disk.delete:unlink_or_rename_to_trash(182): Could not remove or rename C:\Users\ddenu\miniforge3\envs\invest_plugin_schistosomiasis\Scripts\invest.exe.  Please remove this file manually (you may need to reboot to free file handles)
[1] [11:24:47.964] [undefined] successfully removed plugin

[dcdenu4]

It could be because I had the environment activated in another shell.

[dcdenu4]

Actually, what was happening was I had a few zombie InVEST processes running that were never properly ended. These must have been using the plugin env, because once I killed these I was able to force remove the plugin env.

[emlys]

I don't think we can guarantee that no processes outside the workbench are using the env, but we can at least show this warning to the user