fix(callbacks): Defer step/time-triggered ModelCheckpoint saves until validation metrics are available#21106

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Borda merged 8 commits intoLightning-AI:masterfrom

littlebullGit:fix/20919-checkpoint-step-val-metric

Aug 29, 2025

Commits on Aug 28, 2025

Revert "refactor: defer DeepSpeed import and logging configuration until needed"
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committed
Revert "test: add mock-based CPU tests for DeepSpeed strategy import paths"
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Commits on Aug 29, 2025