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% 🎉

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

@@            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	Coverage Δ
src/wanna/core/utils/validators.py	67.81% <83.33%> (+1.14%)	⬆️
src/wanna/core/models/base_instance.py	100.00% <100.00%> (ø)
src/wanna/core/models/gcp_profile.py	100.00% <100.00%> (ø)

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