postcss: Fix import error handling

Note that we will now fail if `inlineImports` is enabled and we cannot resolve an import.

You can work around this by either:

* Use url imports or imports with media queries.
* Set `skipInlineImportsNotFound=true` in the options

Also get the argument order in the different NewFileError* funcs in line.

Fixes #9895

tpl/tplimpl/template_errors.go

@@ -53,7 +53,7 @@ func (t templateInfo) resolveType() templateType {
 
 func (info templateInfo) errWithFileContext(what string, err error) error {
 	err = fmt.Errorf(what+": %w", err)
-	fe := herrors.NewFileError(info.realFilename, err)
+	fe := herrors.NewFileError(err, info.realFilename)
 	f, err := info.fs.Open(info.filename)
 	if err != nil {
 		return err