feat(alert): add support for alert email notification channel

[pggb25]

Summary

Allow to add some email notification channel for alerting
preview env: http://localhost:4200/organization/460616f0-94da-4d35-b631-6fa4ed08eb9a/alerting/notification-channel

figma: https://www.figma.com/design/niVXkQbcNBbaXxmhemiIy1/Alerting?node-id=338-588407&p=f

UX review: https://qovery.slack.com/archives/C090XR4CA69/p1769431524167739?thread_ts=1769073337.693549&cid=C090XR4CA69

Issue:

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 61.95652% with 35 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.74%. Comparing base (c81f0a5) to head (ac7d8fc).
⚠️ Report is 4 commits behind head on staging.

Files with missing lines	Patch %	Lines
...ation-channel-modal/notification-channel-modal.tsx	62.82%	24 Missing and 5 partials ⚠️
...channel-overview/notification-channel-overview.tsx	66.66%	3 Missing and 1 partial ⚠️
...c-configuration-step/metric-configuration-step.tsx	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #2327      +/-   ##
===========================================
+ Coverage    47.53%   49.74%   +2.21%     
===========================================
  Files         1279      405     -874     
  Lines        23524     9365   -14159     
  Branches      6931     2853    -4078     
===========================================
- Hits         11182     4659    -6523     
+ Misses       10191     3792    -6399     
+ Partials      2151      914    -1237     

Flag	Coverage Δ
unittests	49.74% <61.95%> (+2.21%)	⬆️

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[rmnbrd]

Instead of having these 2 functions (validateSlackForm and validateEmailForm), could you use inline validation offered by React Hook Form ?

You will find an example here:

console/libs/domains/organizations/feature/src/lib/git-token-create-edit-modal/git-token-create-edit-modal.tsx

Line 207 in 831937f

pattern: {

[pggb25]

done