Add Initialized and ComponentsCreated conditions to TrainJob API

[dineshkolhe1]

This PR adds Initialized and ComponentsCreated conditions to the TrainJob API to better track the state of job creation and initialization.

• Added Initialized condition to indicate when the TrainJob has been initialized.
• Added ComponentsCreated condition to indicate when the components (e.g., JobSet, Jobs) have been created.
• Updated the controller logic to set these conditions during reconciliation.

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[dineshkolhe1]

@ tenzen-y
can you check my PR where I added some feature .

[andreyvelich]

Hi @dineshkolhe1, as we discussed in this issue we would like to remove the Created condition for now and only keep Complete and Failed: https://github.com/kubeflow/trainer/issues/2459 So we won't introduce the breaking changes in the future:

Please can you help us with that ?

cc @tenzen-y @Electronic-Waste @astefanutti

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