How to replace style-manager font-awesome icon into svg?

Yeah put those changes inside your plugin

grapesjs.init({
	...
	plugins: [
		// start your plugin
		editor => {
			...
			pnm.getButton('views', 'open-sm').set({
				label: '<svg>...</svg>'
			});
		}
	]
})

???... your code is all broken (check the syntax) Probably you want something like this

pnm.getButton('views', 'open-sm').set({
	label: '<svg>...</svg>'
});