[OutputRecorder] re.search on layer_name

[eustlb]

What does this PR do?

As discussed in #44408, this adds the possibility to do regex matching for layer_name in the OutputRecorder.

OutputRecorder(GraniteSpeechConformerBlock, layer_name=r"layers\.(6|12|18)$")

Backward compatibillity:

re.search has the same behavior as substring in string except for patterns like layer_name=".attention" with the dot now matching Xattention. None of the layer_name in the lib trigger this edge case though, but I still updated them all to foster good practices

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[github-actions]

[For maintainers] Suggested jobs to run (before merge)

run-slow: blip, blip_2, decision_transformer, gpt2, instructblip, instructblipvideo, minimax, qwen3_omni_moe, qwen3_vl_moe, switch_transformers, vjepa2

[zvik]

Maybe it will be better to add another option for regex instead of breaking other models:
See: main...zvik:transformers:output-recorder-regex