feat(notification-channel-modal): add email in the creation flow

[pggb25]

Summary

https://qovery.slack.com/archives/C090XR4CA69/p1770972792925219

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

[qovery-github-app]

Qovery can create a Preview Environment for this PR.
To trigger its creation, please post a comment with one of the following command.

Command	Blueprint environment
/qovery preview e68a6997-01bc-4a01-adcd-e763ade8d2ae	test-prod-clone-pipeline-clone-test
/qovery preview 964984c5-fba6-4371-88d3-a5daf99642ab	test-prod
/qovery preview 28c47145-c8e7-4b9d-8d9e-c65c95b48425	staging
/qovery preview cc1de7de-94e5-40f8-8e45-bc8986d9dfec	storybook
/qovery preview {all|UUID1,UUID2,...}	To preview multiple environments

---

This comment has been generated from Qovery AI 🤖.
Below, a word from its wisdom :

Truth can only be found in one place: the code

[codecov]

Codecov Report

❌ Patch coverage is 73.68421% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.96%. Comparing base (f7fe6ef) to head (8664811).
⚠️ Report is 4 commits behind head on staging.

Files with missing lines	Patch %	Lines
...ation-channel-modal/notification-channel-modal.tsx	73.68%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #2377      +/-   ##
===========================================
+ Coverage    46.93%   48.96%   +2.03%     
===========================================
  Files         1225      408     -817     
  Lines        22720     9715   -13005     
  Branches      6726     2974    -3752     
===========================================
- Hits         10663     4757    -5906     
+ Misses       10045     4045    -6000     
+ Partials      2012      913    -1099     

Flag	Coverage Δ
unittests	48.96% <73.68%> (+2.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[RemiBonnet]

🎉 This PR is included in version 1.286.0 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀