META - Extension System Testing CLI Commands

[pavithraes]

CLI Commands

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1. cli command init
2. [META] Write comprehensive tests for --guided-init #1944
   1 of 1
   area: nebari-cli area: testing ✅ needs: tests ✅ +3
3. cli command dev
4. cli command validate
5. cli command keycloak
6. cli command support
7. cli command upgrade
8. Test cli environment variable handling for cloud providers and messaging #1978
   area: nebari-cli area: testing ✅ type: enhancement 💅🏼 +3
9. cli setting secrets via environment variables NEBARI_SECRET__a__b=asdf -> {"a": {"b": "asdf"}} in yaml
10. cli command deploy - ref: CI: Add AWS integration test workflow, clean up  #1977
11. cli command destroy - ref: CI: Add AWS integration test workflow, clean up  #1977
12. cli command render - ref: CI: Add AWS integration test workflow, clean up  #1977

[iameskild]

Thanks a lot for all your work on these tests @sblair-metrostar and @kenafoster!

Marking this as complete and transferring the two lower priority issues to #1958