Uninstall command still are dependent on global npm

[ghost]

As part of #75, we were trying to remove the need for npm to be installed globally so clis could make a bundled executable. It looks like we missed some plugin commands.

The uninstall command still uses global.

imperative/packages/imperative/src/plugins/utilities/npm-interface/uninstall.ts

Lines 63 to 66 in 0a529f3

	const execOutput = execSync(`npm uninstall "${npmPackage}" --prefix ${PMFConstants.instance.PLUGIN_INSTALL_LOCATION} -g`, {
	cwd : PMFConstants.instance.PMF_ROOT,
	stdio: pipe
	});