fix(git-import): explicitly specify ssh key and remove duplicate validation rules

- Add -i flag to explicitly specify ssh key path in git ls-remote operations
- Remove static $rules properties in favor of dynamic rules() method
- Fix test syntax error

tests/Feature/CommandInjectionSecurityTest.php

@@ -169,7 +169,6 @@ describe('API validation rules for path fields', function () {
 
         expect($validator->fails())->toBeFalse();
     });
-});
 
     test('dockerfile_location validation allows paths with @ for scoped packages', function () {
         $rules = sharedDataApplications();