v0.27.2: Fix scheduler `add_noise` 🐞, embeddings in StableCascade, `scale` when using LoRA

All commits

• [scheduler] fix a bug in add_noise by @yiyixuxu in #7386
• [LoRA] fix cross_attention_kwargs problems and tighten tests by @sayakpaul in #7388
• Fix issue with prompt embeds and latents in SD Cascade Decoder with multiple image embeddings for a single prompt. by @DN6 in #7381