Refactor and test utils functions

[ghiggi]

Prework

• [x] I understand and agree to this repository's code of conduct.
• [ ] I understand and agree to this repository's contributing guidelines.
• [x] I have already submitted an issue or discussion thread to discuss my idea with the maintainers.

What kind of change does this PR introduce? (check at least one)

• [ ] Bugfix
• [ ] Feature
• [ ] Documentation
• [ ] Tutorial
• [ ] Code style update
• [x] Refactor
• [ ] Build-related changes
• [ ] Other, please describe:

Does this PR introduce a breaking change? (check one)

• [x] Yes
• [ ] No

If yes, please describe the impact and communicate accordingly:

The PR fulfills these requirements:

• [x] It's submitted to the branch named as follow :
  • Fix a bug: bugfix-<some_key>-<word>
  • Improve the doc: doc-<some_key>-<word>
  • Improve a tutorial tutorial-<some_key>-<word>
  • Add a new feature: feature-<some_key>-<word>
  • Refactor some code: refactor-<some_key>-<word>
  • Optimize some code: optimize-<some_key>-<word>
• [ ] When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• [ ] Don't forget to link PR to issue if you are solving one.
• [ ] All tests are passing.
• [x] New/updated tests are included

[coveralls]

coverage: 61.695% (+2.1%) from 59.56% when pulling e3b58f42dbeeea2f51047cfebdb40a244b23610c on refactor_get_slices into 429f87480a3c93a9b2355819683bec1833dd1e6d on main.

[codecov[bot]]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (429f874) 59.56% compared to head (e3b58f4) 61.69%.

Files	Patch %	Lines
gpm_api/utils/decorators.py	85.71%	6 Missing :warning:
gpm_api/utils/dask.py	50.00%	5 Missing :warning:
gpm_api/utils/checks.py	93.33%	3 Missing :warning:
gpm_api/configs.py	33.33%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #36 +/- ## ========================================== + Coverage 59.56% 61.69% +2.13% ========================================== Files 62 62 Lines 5549 5498 -51 ========================================== + Hits 3305 3392 +87 + Misses 2244 2106 -138 ```

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