feat: EPINIO-722,700 namespace endpoints for apps, service, configs

[johnlcos]

PR Checklist

• Linting Test is passing
• Code is well documented
• If applicable, a PR in the epinio/docs repository has been opened

Summary

Fixes #EPINIO-722 and EPINIO-700

Occurred changes and/or fixed issues

• Use new updated endpoints that handle namespace filtering on the server
• Use proper endpoints in resource dropdowns during configs and service creation

Technical notes summary

• Update api request to handle namespaces for apps, configs and services
• Update apps page to use one table, now that filtering and search are handled on the server
• Use ResourceDropdowns for config and service creation, so that dropdown searches hit the server

Areas or cases that should be tested

On the apps, configs and server page

• Filter by namespace, ensure table shows only rows in that namespace
• Search, view pages while filtering and ensure behavior as expected
  During Config and Service creation
• Ensure resource dropdowns search on server

Areas which could experience regressions

• All changes are focused on the main list pages for apps, services and configs

Screenshot/Video

[dcharles525]

LGTM