Adding TextualInversionLoaderMixin for the controlnet_inpaint_sd_xl pipeline (#7288)

* added TextualInversionMixIn to controlnet_inpaint_sd_xl pipeline


---------
Co-authored-by: YiYi Xu <yixu310@gmail.com>

src/diffusers/pipelines/controlnet/pipeline_controlnet_inpaint_sd_xl.py

@@ -151,7 +151,12 @@ def rescale_noise_cfg(noise_cfg, noise_pred_text, guidance_rescale=0.0):
 
 
 class StableDiffusionXLControlNetInpaintPipeline(
-    DiffusionPipeline, StableDiffusionMixin, StableDiffusionXLLoraLoaderMixin, FromSingleFileMixin, IPAdapterMixin
+    DiffusionPipeline,
+    StableDiffusionMixin,
+    StableDiffusionXLLoraLoaderMixin,
+    FromSingleFileMixin,
+    IPAdapterMixin,
+    TextualInversionLoaderMixin,
 ):
     r"""
     Pipeline for text-to-image generation using Stable Diffusion XL.
@@ -160,6 +165,7 @@ class StableDiffusionXLControlNetInpaintPipeline(
     library implements for all the pipelines (such as downloading or saving, running on a particular device, etc.)
 
     The pipeline also inherits the following loading methods:
+        - [`~loaders.TextualInversionLoaderMixin.load_textual_inversion`] for loading textual inversion embeddings
         - [`~loaders.StableDiffusionXLLoraLoaderMixin.load_lora_weights`] for loading LoRA weights
         - [`~loaders.StableDiffusionXLLoraLoaderMixin.save_lora_weights`] for saving LoRA weights
         - [`~loaders.FromSingleFileMixin.from_single_file`] for loading `.ckpt` files