Feat/refactoring day sheet controller

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 86.66667% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 15.55%. Comparing base (e7aa37d) to head (aa9fd55). Report is 1 commits behind head on main.

Files	Patch %	Lines
...compass/backend/controller/DaySheetController.java	50.00%	1 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #79 +/- ## ============================================ + Coverage 14.79% 15.55% +0.76% - Complexity 76 87 +11 ============================================ Files 46 47 +1 Lines 1413 1421 +8 Branches 244 244 ============================================ + Hits 209 221 +12 + Misses 1155 1147 -8 - Partials 49 53 +4 ``` | [Flag](https://app.codecov.io/gh/ZHAW-PM4-Compass/compass/pull/79/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ZHAW-PM4-Compass) | Coverage Δ | | |---|---|---| | [backend](https://app.codecov.io/gh/ZHAW-PM4-Compass/compass/pull/79/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ZHAW-PM4-Compass) | `54.78% <86.66%> (+2.00%)` | :arrow_up: | | [frontend](https://app.codecov.io/gh/ZHAW-PM4-Compass/compass/pull/79/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ZHAW-PM4-Compass) | `0.87% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ZHAW-PM4-Compass#carryforward-flags-in-the-pull-request-comment) to find out more.

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