Fix `up ctx` for local and disconnected spaces

[RedbackThomson]

What happened?

@sttts ran the following commands and provided the output:

• gcloud get credentials
• up ctx ✅
• up ctx ./default ✅
• up ctx ./ctp-kine ❌
• up ctx . broken due to upper command: Kubeconfig context "upbound": Upbound organizations, should be the group. ❌
• up ctx interactively going into ctp-kine ✅
• up ctx . broken again Kubeconfig context "upbound": Upbound organizations ❌
• up ctx - has wrong output: Kubeconfig context "upbound": Upbound organizations , ❌ and I lost the group ❌
• up ctx – shows the organizations again although I am on the hub ❌

up ctx should work identically in cloud as it does in disconnected spaces.

How can we reproduce it?

What environment did it happen in?

[RedbackThomson]

First part of the fix https://github.com/upbound/up/pull/491

[RedbackThomson]

I can successfully validate that all of these commands are now working as expected! ❤️