[UX] Fix the output skipped lines

[Michaelvll]

Blocked by #3575
In #3572, we changed the skip lines for setup command, which accidentally hide some lines in the run output. We now make the skip_lines more robust and add a smoke test for it.

Master:
sky launch -c test-output --cloud gcp --cpus 2

I 05-23 08:45:47 cloud_vm_ray_backend.py:3212] Running setup on 1 node.
Warning: Permanently added '34.134.84.60' (ECDSA) to the list of known hosts.
running setup
I 05-23 08:45:50 cloud_vm_ray_backend.py:3225] Setup completed.
I 05-23 08:45:57 cloud_vm_ray_backend.py:3314] Job submitted with Job ID: 1
INFO: Waiting for task resources on 1 node. This will block if the cluster is full.
INFO: All task resources reserved.
INFO: Reserved IPs: ['10.128.0.32']
(task, pid=3789) finish
INFO: Job finished (status: SUCCEEDED).
Shared connection to 34.134.84.60 closed.
I 05-23 08:28:19 cloud_vm_ray_backend.py:3354] Job ID: 1

This PR:

I 05-23 08:28:05 cloud_vm_ray_backend.py:3217] Running setup on 1 node.
hi
I 05-23 08:28:07 cloud_vm_ray_backend.py:3230] Setup completed.
I 05-23 08:28:13 cloud_vm_ray_backend.py:3319] Job submitted with Job ID: 2
I 05-23 08:28:15 log_lib.py:408] Start streaming logs for job 2.
INFO: Tip: use Ctrl-C to exit log streaming (task will not be killed).
INFO: Waiting for task resources on 1 node. This will block if the cluster is full.
INFO: All task resources reserved.
INFO: Reserved IPs: ['10.128.0.30']
(task, pid=6090) hi
INFO: Job finished (status: SUCCEEDED).
I 05-23 08:28:19 cloud_vm_ray_backend.py:3354] Job ID: 2

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
• All smoke tests: pytest tests/test_smoke.py --kubernetes
• Relevant individual smoke tests: pytest tests/test_smoke.py::test_fill_in_the_name
  • pytest tests/test_smoke.py::test_minimal
• Backward compatibility tests: conda deactivate; bash -i tests/backward_compatibility_tests.sh

[cblmemo]

Thanks for identifying and fixing this @Michaelvll ! It looks great and should be ready to go after the format test passed ;)