feat(service-healthchecks): add creation flow and settings

[RemiBonnet]

Summary

Healthchecks settings and step in the creation flow for application and container

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

[RemiBonnet]

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[codecov]

Codecov Report

❌ Patch coverage is 39.56835% with 84 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (new-navigation@9326b7c). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...gs/application-container-healthchecks-settings.tsx	0.00%	24 Missing ⚠️
...shared/util-js/src/lib/format-healthcheck-probe.ts	28.57%	10 Missing and 10 partials ⚠️
...ation-container-healthchecks/healthchecks-utils.ts	29.62%	16 Missing and 3 partials ⚠️
...s-form/application-container-healthchecks-form.tsx	71.42%	3 Missing and 7 partials ⚠️
...althchecks/step-healthchecks/step-healthchecks.tsx	63.63%	6 Missing and 2 partials ⚠️
...t-settings/application-container-port-settings.tsx	0.00%	2 Missing ⚠️
libs/shared/util-js/src/index.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##             new-navigation    #2466   +/-   ##
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  Coverage                  ?   42.62%           
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  Files                     ?     1052           
  Lines                     ?    20711           
  Branches                  ?     6014           
=================================================
  Hits                      ?     8828           
  Misses                    ?    10271           
  Partials                  ?     1612           

Flag	Coverage Δ
unittests	42.62% <39.56%> (?)

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[TheoGrandin74]

@RemiBonnet Two quick feedback:

• Can we maybe make it so the callout is below the heading section and divider? It will look cleaner and be more consistent with the other setting pages
• Also noticed that the header for both Health Checks and Port pages are not "full size" like the other settings page (general/resources but also other settings page like org settings etc.)