[UX] Show head ip in sky status -a

[cblmemo]

This PR fixes #1779 by introducing HEAD_IP column in sky status -a.

One example:

(sky-dev) ➜  skypilot git:(show-ip-in-status) ✗ sky status -a
Clusters
NAME             LAUNCHED        RESOURCES              REGION       ZONE           STATUS  AUTOSTOP  HEAD_IP        COMMAND                 
sky-0a05-memory  a few secs ago  1x GCP(n2-standard-8)  us-central1  us-central1-a  UP      -         34.122.179.25  sky launch --cloud gcp  

Managed spot jobs
No in progress jobs. (See: sky spot -h)

Tested (run the relevant ones):

• Code formatting: bash format.sh
• Any manual or new tests for this PR (please specify below)
• All smoke tests: pytest tests/test_smoke.py
• Relevant individual smoke tests: pytest tests/test_smoke.py::test_fill_in_the_name
• Backward compatibility tests: bash tests/backward_comaptibility_tests.sh

[Michaelvll]

Thanks for adding this @cblmemo! Left some comments.

[Michaelvll]

Thanks for adding this @cblmemo! It should be useful for the case where the user try to launch jupyter notebooks.