refactor: update formatCronExpression util

[rmnbrd]

Summary

Tiny change on the formatCronExpression util

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

[RemiBonnet]

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 47.15%. Comparing base (cb5821f) to head (54c3251).
⚠️ Report is 1 commits behind head on staging.

Files with missing lines	Patch %	Lines
...s/shared/util-js/src/lib/format-cron-expression.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #2420      +/-   ##
===========================================
- Coverage    53.84%   47.15%   -6.70%     
===========================================
  Files          331     1252     +921     
  Lines         6808    23142   +16334     
  Branches      2128     6832    +4704     
===========================================
+ Hits          3666    10912    +7246     
- Misses        2411    10151    +7740     
- Partials       731     2079    +1348     

Flag	Coverage Δ
unittests	47.15% <0.00%> (-6.70%)	⬇️

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[RemiBonnet]

🎉 This PR is included in version 1.291.1 🎉

The release is available on GitHub release

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