[Serve] Support --skip-failed/-s to skip failed replica in sky serve status CLI

[cblmemo]

Closes #3547 .

Tested (run the relevant ones):

• Code formatting: bash format.sh
• Any manual or new tests for this PR (please specify below)

(sky) ➜  skypilot git:(serve-skip-failed) ✗ ssst   
Services
NAME  VERSION  UPTIME  STATUS      REPLICAS  ENDPOINT                                                                  
fail  -        -       NO_REPLICA  0/0       http://localhost:30072/skypilot/sky-serve-controller-402b1bba-402b/30001  

Service Replicas
SERVICE_NAME  ID  VERSION  ENDPOINT  LAUNCHED  RESOURCES  STATUS                REGION  
fail          1   1        -         -         -          FAILED_INITIAL_DELAY  -       
(sky) ➜  skypilot git:(serve-skip-failed) ✗ ssst -s
Services
NAME  VERSION  UPTIME  STATUS      REPLICAS  ENDPOINT                                                                  
fail  -        -       NO_REPLICA  0/0       http://localhost:30072/skypilot/sky-serve-controller-402b1bba-402b/30001  

Service Replicas
No existing replicas.

• 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: conda deactivate; bash -i tests/backward_compatibility_tests.sh

[cblmemo]

To discuss: Should we skip the failed replicas in the service table shown by sky status as well?