Update training operator installation to use SSA

[astefanutti]

Latest version of the training operator will require to use server side apply to install its CRDs, as their sizes have increased beyond what client-side apply can handled.

See kubeflow/training-operator#2332 (comment) for more details.

/cc @tenzen-y @andreyvelich

[google-oss-prow]

Hi @astefanutti. Thanks for your PR.

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[andreyvelich]

Thanks @astefanutti!
/lgtm
/approve

[google-oss-prow]

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