feat: check on custom labels

[JacekHebda]

Describe your changes

Issue ticket number and link

Checklist before requesting a review

• [ ] I have performed a self-review of my code
• [ ] 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

Base: 71.97% // Head: 72.02% // Increases project coverage by +0.04% :tada:

Coverage data is based on head (64dc92b) compared to base (af2acba). Patch coverage: 87.50% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #53 +/- ## ========================================== + Coverage 71.97% 72.02% +0.04% ========================================== Files 55 55 Lines 2566 2574 +8 ========================================== + Hits 1847 1854 +7 - Misses 719 720 +1 ``` | [Impacted Files](https://codecov.io/gh/avast/wanna-ml/pull/53?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/utils/validators.py](https://codecov.io/gh/avast/wanna-ml/pull/53/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=avast#diff-c3JjL3dhbm5hL2NvcmUvdXRpbHMvdmFsaWRhdG9ycy5weQ==) | `67.81% <83.33%> (+1.14%)` | :arrow_up: | | [src/wanna/core/models/base\_instance.py](https://codecov.io/gh/avast/wanna-ml/pull/53/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=avast#diff-c3JjL3dhbm5hL2NvcmUvbW9kZWxzL2Jhc2VfaW5zdGFuY2UucHk=) | `100.00% <100.00%> (ø)` | | | [src/wanna/core/models/gcp\_profile.py](https://codecov.io/gh/avast/wanna-ml/pull/53/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=avast#diff-c3JjL3dhbm5hL2NvcmUvbW9kZWxzL2djcF9wcm9maWxlLnB5) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=avast). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=avast)

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