fix(ci): Generate valid release version for Python package

[andreyvelich]

We should correctly parse the version for Python package for RCs.

Ref: #2155

/cc @milinddethe15 @Krishna-kg732 @kubeflow/kubeflow-trainer-team

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In response to this:

We should correctly parse the version for Python package for RCs.

Ref: #2155

/cc @milinddethe15 @Krishna-kg732 @kubeflow/kubeflow-trainer-team

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[Copilot]

Pull request overview

Bumps the project version to v2.2.0-rc.0 and aligns the generated Python SDK versioning with PEP 440 conventions for release candidates.

Changes:

• Update root VERSION to v2.2.0-rc.0.
• Adjust Python API generation to convert -rc.N into rcN for packageVersion.
• Update Python SDK __version__ to 2.2.0rc0.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
VERSION	Bumps repository version to v2.2.0-rc.0.
hack/python-api/gen-api.sh	Normalizes VERSION into a Python/PEP440-compatible packageVersion for OpenAPI generator output.
api/python_api/kubeflow_trainer_api/__init__.py	Updates the SDK __version__ to match the RC version format.