pkg/environment: Remove some file-based functions

This commit removes certain file-based functions from 'pkg/environment',
continuing the migration to entirely remove the package.

pkg/fsx/type.go

@@ -3,30 +3,31 @@ package fsx
 
 import (
 	"io/fs"
+	"os"
 
 	"github.com/FAU-CDI/wisski-distillery/pkg/environment"
 )
 
 // Exists checks if the given path exists
 func Exists(env environment.Environment, path string) bool {
-	_, err := env.Lstat(path)
+	_, err := os.Lstat(path)
 	return err == nil
 }
 
 // IsDirectory checks if the provided path exists and is a directory
 func IsDirectory(env environment.Environment, path string) bool {
-	info, err := env.Stat(path)
+	info, err := os.Stat(path)
 	return err == nil && info.Mode().IsDir()
 }
 
 // IsFile checks if the provided path exists and is a regular file
 func IsFile(env environment.Environment, path string) bool {
-	info, err := env.Stat(path)
+	info, err := os.Stat(path)
 	return err == nil && info.Mode().IsRegular()
 }
 
 // IsLink checks if the provided path exists and is a symlink
 func IsLink(env environment.Environment, path string) bool {
-	info, err := env.Lstat(path)
+	info, err := os.Lstat(path)
 	return err == nil && info.Mode()&fs.ModeSymlink != 0
 }