feat(onboarding): add use cases selection step

[jul-dan]

Summary

Issue: QOV-1998

Remove the question dropdown

Remove the hosting infra dropdown

Add a new step to ask for which use cases they are coming for (multi-select)

Send a posthog event with the usecases selection

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

❌ Patch coverage is 21.73913% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.12%. Comparing base (582fa50) to head (f5d63b2).
⚠️ Report is 3 commits behind head on staging.

Files with missing lines	Patch %	Lines
.../feature/src/lib/step-use-cases/step-use-cases.tsx	0.00%	14 Missing ⚠️
.../src/lib/onboarding-project/onboarding-project.tsx	42.85%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #2745      +/-   ##
===========================================
- Coverage    46.16%   46.12%   -0.05%     
===========================================
  Files         1208      757     -451     
  Lines        25695    19045    -6650     
  Branches      7572     5783    -1789     
===========================================
- Hits         11863     8784    -3079     
+ Misses       11761     8674    -3087     
+ Partials      2071     1587     -484     

Flag	Coverage Δ
unittests	46.12% <21.73%> (-0.05%)	⬇️

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[RemiBonnet]

🎉 This PR is included in version 1.316.0 🎉

The release is available on GitHub release

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