fix(variable-list): replace service type by Service label

[RemiBonnet]

Summary

• Display "Service" instead of serviceType

https://qovery.slack.com/archives/C0AML0VDUV8/p1774360937540619

Screenshots / Recordings

Testing

• Changes tested locally in the relevant Console's pages and Storybooks
• yarn test or yarn test -u (if you need to regenerate snapshots)
• yarn format
• yarn lint

PR Checklist

• I followed naming, styling, and TypeScript rules (see .cursor/rules)
• I performed a self-review (diff inspected, dead code removed)
• I titled the PR using Conventional Commits with a scope when possible (e.g. feat(service): add new Terraform service) - required for semantic-release
• I only kept necessary comments, written in English (watch for useless AI comments)
• I involved a designer to validate UI changes if I am not a designer
• I covered new business logic with tests (unit)
• I confirmed CI is green (Codecov red can be accepted)
• I reviewed and executed locally any AI-assisted code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 44.74%. Comparing base (c4d645a) to head (498f281).
⚠️ Report is 2 commits behind head on new-navigation.

Additional details and impacted files

@@                Coverage Diff                 @@
##           new-navigation    #2561      +/-   ##
==================================================
- Coverage           45.49%   44.74%   -0.76%     
==================================================
  Files                1116      636     -480     
  Lines               22298    14834    -7464     
  Branches             6530     4377    -2153     
==================================================
- Hits                10145     6637    -3508     
+ Misses              10296     7012    -3284     
+ Partials             1857     1185     -672     

Flag	Coverage Δ
unittests	44.74% <100.00%> (-0.76%)	⬇️

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[rmnbrd]

LGTM 👏