Add transformer cache context for SkyReels-V2 pipelines & Update docs

[tolgacangoz]

This PR adds transformer cache context for SkyReels-V2 pipelines and & updates docs.

• Pipelines and pipeline callbacks: @yiyixuxu and @asomoza

[tolgacangoz]

Similar to https://huggingface.co/docs/transformers/main/en/model_doc/speech_to_text_2#:~:text=This%20model%20was%20contributed%20by%20Patrick%20von%20Platen.

[tolgacangoz]

FLF2V was producing bad results at the 1.3B model; I didn't even create its HF repo, but put it here as a placeholder at that time.

[Copilot]

Pull request overview

This PR adds transformer cache context support to SkyReels-V2 pipelines to enable caching optimizations during inference. The cache contexts separate conditional and unconditional forward passes with "cond" and "uncond" labels respectively.

• Wraps transformer calls with cache_context() for both conditional and unconditional predictions
• Applies the pattern consistently across all five SkyReels-V2 pipeline variants
• Updates documentation with contributor credit (unrelated change)

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/diffusers/pipelines/skyreels_v2/pipeline_skyreels_v2_i2v.py	Wraps conditional and unconditional transformer calls with cache_context("cond") and cache_context("uncond")
src/diffusers/pipelines/skyreels_v2/pipeline_skyreels_v2_diffusion_forcing_v2v.py	Wraps conditional and unconditional transformer calls with cache_context("cond") and cache_context("uncond")
src/diffusers/pipelines/skyreels_v2/pipeline_skyreels_v2_diffusion_forcing_i2v.py	Wraps conditional and unconditional transformer calls with cache_context("cond") and cache_context("uncond")
src/diffusers/pipelines/skyreels_v2/pipeline_skyreels_v2_diffusion_forcing.py	Wraps conditional and unconditional transformer calls with cache_context("cond") and cache_context("uncond")
src/diffusers/pipelines/skyreels_v2/pipeline_skyreels_v2.py	Wraps conditional and unconditional transformer calls with cache_context("cond") and cache_context("uncond")
docs/source/en/api/pipelines/skyreels_v2.md	Removes FLF2V model listing and adds contributor credit (unrelated to cache context changes)

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[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

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[Copilot]

A model listing line for "SkyReels-V2 FLF2V 1.3B - 540P" appears to have been removed from the supported models list. If this model is no longer supported or was listed incorrectly, this change should be documented in the PR description to explain why it was removed.

Suggested change

	> **Note:** The model "SkyReels-V2 FLF2V 1.3B - 540P" is no longer listed as a supported model. It was removed from the list as it is not currently supported in Diffusers, or was previously listed in error.