fix: handle kubernetes describe failures gracefully (#1150)

[clumsy]

When job is not found we will show State=UNKNOWN and surface the error in Msg

Test plan:
[x] added unit test
[x] torchx status sfai_kubernetes://torchx/real-namespace:bogus-job-id

AppStatus:
    State: UNKNOWN
    Num Restarts: -1
    Roles: 
    Msg: Not Found: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"jobs.batch.volcano.sh \"bogus-jobs-id\" not found","reason":"NotFound","details":{"name":"bogus-job-id","group":"batch.volcano.sh","kind":"jobs"},"code":404}

    Structured Error Msg: <NONE>
    UI URL: None

[clumsy]

For your consideration @kiukchung @d4l3k
Looks like we might need the same for other APIs

[clumsy]

setup_pyre.sh lacked +x so I added it here, don't think it justifies a full PR

[kiukchung]

when the job is not found describe API should return None no?

[clumsy]

Do you mean State: None? What would you like it to show @kiukchung ? I'm happy to update my fix as long as it's not an exception.