[r2.0.0] Change default for always_save_context to True

[athitten]

What does this PR do ?

Set the default value of always_save_context to True as its required to have the context for evaluating NeMo 2.0 ckpt as of now since we are converting it to 1.0 ckpt using this script: convert_nemo2_for_export.py to export to TRTLLM for evaluation.
Replicate of PR 10547 which has been merged to main.

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[ericharper]

Until we measure the effect of this change at scale, ~128 nodes, we shouldn't change the default.

[github-actions]

This PR is stale because it has been open for 14 days with no activity. Remove stale label or comment or update or this will be closed in 7 days.

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