Move jquery-minicolors to npm/webpack (#12305)

* Move jquery-minicolors to npm/webpack

- Unvendor and add as npm dependency
- Removed unneeded backend variable
- Fixed existing bug where picker would previously initizalize to the
  same green color when editing a label.

There was probably a version bump because the previous version was
over 3 years old but it seems to be compatible.

* use file-loader

* trailing comma and comment update

* misc tweaks

Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

web_src/js/features/colorpicker.js

@@ -0,0 +1,10 @@
+export default async function createColorPicker($els) {
+  if (!$els || !$els.length) return;
+
+  await Promise.all([
+    import(/* webpackChunkName: "minicolors" */'@claviska/jquery-minicolors'),
+    import(/* webpackChunkName: "minicolors" */'@claviska/jquery-minicolors/jquery.minicolors.css'),
+  ]);
+
+  $els.minicolors();
+}