[kubectl-plugin] Refactor job_submit

[win5923]

Why are these changes needed?

Refactor job submit to to be more readable.

• Simplify complex inline logic into dedicated helper functions
• Add constants for timeout values and polling intervals

E2E test:

$ kubectl ray job submit --name ray-job-sample  --working-dir ./ --runtime-env ./runtimeEnv.yaml  -- python test.py
Submitted RayJob ray-job-sample.
Waiting for RayCluster ray-job-sample-fdzvv to be ready...
Waiting for port forwarding...Port forwarding service ray-job-sample-fdzvv-head-svc
Forwarding from 127.0.0.1:8265 -> 8265
Forwarding from [::1]:8265 -> 8265
Handling connection for 8265
Port forwarding started on http://localhost:8265
Generated submission ID for Ray job: raysubmit_UwJ5PzzqGzcJDbyc
Ray command: [ray job submit --address http://localhost:8265 --runtime-env runtimeEnv.yaml --submission-id raysubmit_UwJ5PzzqGzcJDbyc --working-dir ./ -- python test.py]
Running Ray submit job command...
Handling connection for 8265
Handling connection for 8265
Handling connection for 8265
2025-09-02 16:23:50,051 INFO dashboard_sdk.py:338 -- Uploading package gcs://_ray_pkg_833f649c1ed96aac.zip.
2025-09-02 16:23:50,052 INFO packaging.py:588 -- Creating a file package for local module './'.
Handling connection for 8265
Handling connection for 8265
2025-09-02 16:23:50,026 INFO cli.py:41 -- Job submission server address: http://localhost:8265
2025-09-02 16:23:50,628 SUCC cli.py:65 -- -------------------------------------------------------
2025-09-02 16:23:50,628 SUCC cli.py:66 -- Job 'raysubmit_UwJ5PzzqGzcJDbyc' submitted successfully
2025-09-02 16:23:50,628 SUCC cli.py:67 -- -------------------------------------------------------
2025-09-02 16:23:50,628 INFO cli.py:291 -- Next steps
2025-09-02 16:23:50,628 INFO cli.py:292 -- Query the logs of the job:
2025-09-02 16:23:50,628 INFO cli.py:294 -- ray job logs raysubmit_UwJ5PzzqGzcJDbyc
2025-09-02 16:23:50,628 INFO cli.py:296 -- Query the status of the job:
2025-09-02 16:23:50,628 INFO cli.py:298 -- ray job status raysubmit_UwJ5PzzqGzcJDbyc
2025-09-02 16:23:50,628 INFO cli.py:300 -- Request the job to be stopped:
2025-09-02 16:23:50,629 INFO cli.py:302 -- ray job stop raysubmit_UwJ5PzzqGzcJDbyc
Handling connection for 8265
Handling connection for 8265
Handling connection for 8265
2025-09-02 16:23:50,675 INFO cli.py:312 -- Tailing logs until the job exits (disable with --no-wait):
2025-09-02 09:23:50,446 INFO job_manager.py:531 -- Runtime env is setting up.
2025-09-02 09:23:55,338 INFO worker.py:1554 -- Using address 10.244.0.18:6379 set in the environment variable RAY_ADDRESS
2025-09-02 09:23:55,338 INFO worker.py:1694 -- Connecting to existing Ray cluster at address: 10.244.0.18:6379...
2025-09-02 09:23:55,350 INFO worker.py:1879 -- Connected to Ray cluster. View the dashboard at 10.244.0.18:8265 
test_counter got 1
test_counter got 2
test_counter got 3
test_counter got 4
test_counter got 5
2025-09-02 16:24:00,728 SUCC cli.py:65 -- ------------------------------------------
2025-09-02 16:24:00,728 SUCC cli.py:66 -- Job 'raysubmit_UwJ5PzzqGzcJDbyc' succeeded
2025-09-02 16:24:00,728 SUCC cli.py:67 -- ------------------------------------------
Waiting for job to finish...
Current status: SUCCEEDED (RayJob: ray-job-sample, JobID: raysubmit_UwJ5PzzqGzcJDbyc)
Job raysubmit_UwJ5PzzqGzcJDbyc finished with status SUCCEEDED.

Related issue number

Checks

• I've made sure the tests are passing.
• Testing Strategy
  • Unit tests
  • Manual tests
  • This PR is not tested :(