feat: add missing hierarchymg methods

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 42.98%. Comparing base (b4db945) to head (a2f947d). Report is 4 commits behind head on main.

Files	Patch %	Lines
deployment/managementgroup.go	0.00%	6 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #121 +/- ## ========================================== - Coverage 43.20% 42.98% -0.22% ========================================== Files 16 16 Lines 1178 1184 +6 ========================================== Hits 509 509 - Misses 570 576 +6 Partials 99 99 ```

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