fix(api): centralize upsert validation + improve nested error handling

[tatarco]

feat(api): add upsert validation

What changed? Why was the change needed?

1. Established a single validation entry point for Upsert use case.
2. Fixed issue with nested validation based on @djabarovgeorge solution in an old open PR.
3. Removed the Base Command duplication so all commands use the same validation mechanism.
4. Fix Wrong Validations around issues in internal commands ( update + create)
5. Enhance the Filter to produce better and more detailed 400 errors around validation issues.
6. Make sure post process process update issues if no issues exist instead of empty object, the class validator does not handle empty object well for Record<string,?>
7. Added tests to validate correct behavior around tags and missing step name, make sure both fire good validation 400 erors

Screenshots

Expand for optional sections

Related enterprise PR

Special notes for your reviewer

[linear]

NV-4918 Preview returns 500 if the step has a Missing Name

[netlify]

✅ Deploy Preview for dashboard-v2-novu-staging ready!

Name	Link
🔨 Latest commit	8de9cc0
🔍 Latest deploy log	https://app.netlify.com/sites/dashboard-v2-novu-staging/deploys/675a77680f756d0008e36ead
😎 Deploy Preview	https://deploy-preview-7173.dashboard-v2.novu-staging.co
📱 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.

[netlify]

✅ Deploy Preview for novu-stg-vite-dashboard-poc ready!

Name	Link
🔨 Latest commit	5bb5222
🔍 Latest deploy log	https://app.netlify.com/sites/novu-stg-vite-dashboard-poc/deploys/674dad98da4f340008d9a043
😎 Deploy Preview	https://deploy-preview-7173.dashboard-v2.novu-staging.co
📱 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.

[netlify]

✅ Deploy Preview for dev-web-novu ready!

Name	Link
🔨 Latest commit	8de9cc0
🔍 Latest deploy log	https://app.netlify.com/sites/dev-web-novu/deploys/675a77682c5f87000829502a
😎 Deploy Preview	https://deploy-preview-7173.dashboard.novu-staging.co
📱 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.

[pkg-pr-new]

Open in Stackblitz

@novu/client

npm i https://pkg.pr.new/novuhq/novu/@novu/client@7173

@novu/framework

npm i https://pkg.pr.new/novuhq/novu/@novu/framework@7173

@novu/headless

npm i https://pkg.pr.new/novuhq/novu/@novu/headless@7173

@novu/node

npm i https://pkg.pr.new/novuhq/novu/@novu/node@7173

@novu/notification-center

npm i https://pkg.pr.new/novuhq/novu/@novu/notification-center@7173

novu

npm i https://pkg.pr.new/novuhq/novu@7173

@novu/providers

npm i https://pkg.pr.new/novuhq/novu/@novu/providers@7173

@novu/shared

npm i https://pkg.pr.new/novuhq/novu/@novu/shared@7173

commit: 8de9cc0