fix: get_cluster with job submission

[Bobbins228]

Issue link

RHOAIENG-16073

What changes have been made

Moved initialisation of _job_submission_client

Verification steps

Setup

Notebook server ODH/RHOAI/Local

• Clone this repository with git clone https://github.com/project-codeflare/codeflare-sdk.git
• Checkout this PR's branch
• Run poetry build - install if needed (pip install poetry)
• Run pip install --force-reinstall dist/codeflare_sdk-0.0.0.dev0-py3-none-any.whl
• Restart your notebook kernel

Testing

• Create a Ray Cluster
• Use the get_cluster method on the created Ray Cluster
• Submit a Job via the job client
• client = cluster.job_client
• Ensure the client is initialised without error

Checks

• I've made sure the tests are passing.
• Testing Strategy
  • Unit tests
  • Manual tests
  • Testing is not required for this change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.05%. Comparing base (9e2adef) to head (1e5f4d4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #770   +/-   ##
=======================================
  Coverage   93.05%   93.05%           
=======================================
  Files          36       36           
  Lines        2403     2403           
=======================================
  Hits         2236     2236           
  Misses        167      167           

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[ChristianZaccaria]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ChristianZaccaria, Ygnas

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ChristianZaccaria, Ygnas

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [ChristianZaccaria]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment