feat: add delete freight endpoint to api server

[devholic]

Resolves #1071

[netlify]

✅ Deploy Preview for docs-kargo-akuity-io ready!

Name	Link
🔨 Latest commit	1884d23
🔍 Latest deploy log	https://app.netlify.com/sites/docs-kargo-akuity-io/deploys/6566b61cf8c97a00082963be
😎 Deploy Preview	https://deploy-preview-1177.kargo.akuity.io
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[codecov]

Codecov Report

Attention: 29 lines in your changes are missing coverage. Please review.

Comparison is base (a569a42) 48.83% compared to head (1884d23) 48.67%.

Files	Patch %	Lines
internal/api/delete_freight_v1alpha1.go	0.00%	21 Missing ⚠️
internal/api/validators.go	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1177      +/-   ##
==========================================
- Coverage   48.83%   48.67%   -0.17%     
==========================================
  Files         115      116       +1     
  Lines        8573     8602      +29     
==========================================
  Hits         4187     4187              
- Misses       4234     4263      +29     
  Partials      152      152              

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

[krancour]

LGTM