Fixes #14221: Use Sass Rails template when compiling plugin assets
The Sass::Rails::Template is needed to resolve css files imported in an SCSS file without setting them to css imports which lead to 404s in production.
(cherry picked from commit d8520a15230d854e65bb7de012a1a7e4f9806392)
Related issues
Bug #14221: Plugin asset compilation does not expand SCSS imports of CSS files
Fixes #14221: Use Sass Rails template when compiling plugin assets
The Sass::Rails::Template is needed to resolve css files imported
in an SCSS file without setting them to css imports which lead
to 404s in production.
(cherry picked from commit d8520a15230d854e65bb7de012a1a7e4f9806392)