chore: remove incomplete gitlab_project_repository_file resource (#650)

This file was part of #556 but did not include a test, docs, or an entry in gitlab/provider.go, so we are removing it until it can be completed.

Author: mattkasa

gitlab/resource_gitlab_project_repository_file.go

@@ -202,21 +202,6 @@ func buildTwoPartID(a, b *string) string {
 	return fmt.Sprintf("%s:%s", *a, *b)
 }
 
-// return the pieces of id `a:b:c` as a, b, c
-func parseThreePartID(id string) (string, string, string, error) {
-	parts := strings.SplitN(id, ":", 3)
-	if len(parts) != 3 {
-		return "", "", "", fmt.Errorf("Unexpected ID format (%q). Expected project:key", id)
-	}
-
-	return parts[0], parts[1], parts[2], nil
-}
-
-// format the strings into an id `a:b:c`
-func buildThreePartID(a, b, c *string) string {
-	return fmt.Sprintf("%s:%s:%s", *a, *b, *c)
-}
-
 var accessLevelID = map[string]gitlab.AccessLevelValue{
 	"no one":     gitlab.NoPermissions,
 	"guest":      gitlab.GuestPermissions,