refactor: add minor improvements to manager logic

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 46.66667% with 16 lines in your changes missing coverage. Please review.

Project coverage is 81.22%. Comparing base (0da21a5) to head (96bf398). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../Physics/Environment/Atmospheric/Earth/Manager.cpp	29.41%	12 Missing :warning:
...paceToolkit/Physics/Environment/Magnetic/Earth.cpp	72.72%	3 Missing :warning:
...oolkit/Physics/Environment/Gravitational/Earth.cpp	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #275 +/- ## ======================================= Coverage 81.22% 81.22% ======================================= Files 97 97 Lines 8105 8106 +1 ======================================= + Hits 6583 6584 +1 Misses 1522 1522 ```

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