Avoid initializing optimizers during deepspeed evaluation

[rohitgr7]

What does this PR do?

Fixes #14928
Fixes: #10640

Support was added here: microsoft/DeepSpeed#1514
And it's in v0.6.0 which is the minimum we support: microsoft/DeepSpeed@v0.5.6...v0.6.0

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cc @Borda @awaelchli @rohitgr7 @akihironitta