[v10.1.x] Slug: Combine various slugify fixes for special character handling (#73173)

Slug: Combine various slugify fixes for special character handling (#73164)

* combine various slugify fixes for special character handling

* a couple more test cases

* update more tests

* goimports

(cherry picked from commit dd97038b00)

Co-authored-by: Dan Cech <dcech@grafana.com>

pkg/services/accesscontrol/models_test.go

@@ -64,7 +64,7 @@ func TestSaveExternalServiceRoleCommand_Validate(t *testing.T) {
 				Permissions:       []Permission{{Action: "users:read", Scope: "users:id:1"}},
 			},
 			wantErr: false,
-			wantID:  "thisis-a-very-strange-___-app-name",
+			wantID:  "thisis-a-very-strange-app-name",
 		},
 		{
 			name: "invalid empty Action",