Update Qwen2.5 configs

[joecummings]

1. I turned activation checkpointing off for all 0.5B models and for 1.5B LoRA models. No point.
2. I turned on memory logging

Everything else is cosmetic.

[pytorch-bot]

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[ebsmothers]

I understand that you're making the filename change 0_5B -> 0.5B for consistency with other configs, but honestly would prefer to just move everything to 0_5B so it matches the builders (doesn't have to be in this PR though)

[felipemello1]

+1, i would prefer if we avoided using periods for names, and only use them when they are a path or file type

[felipemello1]

for llama3.2 we added 3.2 to the path like you did, but not the components

[joecummings]

This is the same thing we have here, no?

[calvinpelletier]

I thought we use underscores instead of periods?: #1863 (comment)

[ebsmothers]

controversial take but if we want consistency we should leave these in. idc too much for this PR but I thought that was the whole point of a bunch of @felipemello1's changes. Either way would like to compress this config substantially in a separate PR

[felipemello1]

I am ok with making the profiler simpler is a separate PR

[ebsmothers]

I hate decimal points

[joecummings]

I thought we use underscores instead of periods?: #1863 (comment)

Yeah this is a misleading comment. We do use underscores for model builders, but the model should just get downloaded to a directory with the exact same name as the model on the Hub.