Plugins: currently git is required to be installed and on path

[dcdenu4]

When setting up plugins on a bare bones Windows VM, I got an error that git was not a recognized command. Since we have mamba, I'm wondering if we can just have a step that does: mamba install git into base. It'd be good to make sure this didn't interfere with another git installation, that or checking first somehow to see if git is already on path. Or, if the first git command fails, try installing.

[09:35:19.993] [undefined] adding plugin at https://github.com/natcap/schistosomiasis.git
[09:35:19.996] [undefined] git [
  'clone',
  '--depth',
  '1',
  '--no-checkout',
  'https://github.com/natcap/schistosomiasis.git',
  'C:/Users/User/AppData/Local/Temp/natcap-invest-xoLO2v'
]
[09:35:20.036] [undefined] 'git' is not recognized as an internal or external command,
operable program or batch file.