fix: MLOPS-474 wanna-ml managed notebooks fail to create when labels …

[jsilva]

Describe your changes

wanna-ml managed notebooks fail to create when labels or metadata is set

Issue ticket number and link

MLOPS-474

Checklist before requesting a review

• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] If it is a core feature, I have added thorough tests.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (0aceb1d) 74.42% compared to head (dfee095) 74.42%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #102 +/- ## ======================================= Coverage 74.42% 74.42% ======================================= Files 57 57 Lines 2839 2839 ======================================= Hits 2113 2113 Misses 726 726 ``` | [Files Changed](https://app.codecov.io/gh/avast/wanna-ml/pull/102?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=avast) | Coverage Δ | | |---|---|---| | [src/wanna/core/services/managed\_notebook.py](https://app.codecov.io/gh/avast/wanna-ml/pull/102?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=avast#diff-c3JjL3dhbm5hL2NvcmUvc2VydmljZXMvbWFuYWdlZF9ub3RlYm9vay5weQ==) | `62.02% <ø> (ø)` | |

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