chore(api): Remove usused workflow-v2 usecases

[SokratisVidros]

What changed? Why was the change needed?

Just a clean up based on the DX guide on the V2 workflow API.

[netlify]

✅ Deploy Preview for dev-web-novu ready!

Name	Link
🔨 Latest commit	4d4cba9
🔍 Latest deploy log	https://app.netlify.com/sites/dev-web-novu/deploys/675b656781ee06000838745a
😎 Deploy Preview	https://deploy-preview-7293.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.

[netlify]

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

Name	Link
🔨 Latest commit	4d4cba9
🔍 Latest deploy log	https://app.netlify.com/sites/dashboard-v2-novu-staging/deploys/675b6567fdfe5400077fca8a
😎 Deploy Preview	https://deploy-preview-7293.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.

[pkg-pr-new]

Open in Stackblitz

@novu/client

npm i https://pkg.pr.new/novuhq/novu/@novu/client@7293

@novu/framework

npm i https://pkg.pr.new/novuhq/novu/@novu/framework@7293

@novu/headless

npm i https://pkg.pr.new/novuhq/novu/@novu/headless@7293

@novu/node

npm i https://pkg.pr.new/novuhq/novu/@novu/node@7293

@novu/notification-center

npm i https://pkg.pr.new/novuhq/novu/@novu/notification-center@7293

novu

npm i https://pkg.pr.new/novuhq/novu@7293

@novu/providers

npm i https://pkg.pr.new/novuhq/novu/@novu/providers@7293

@novu/shared

npm i https://pkg.pr.new/novuhq/novu/@novu/shared@7293

commit: 4d4cba9