Keep preview in cache during task creation (#8766)

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<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Introduced a preview image generation feature that activates after
task creation, enhancing task management capabilities.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

cvat/apps/engine/task.py

@@ -30,6 +30,7 @@
 
 from cvat.apps.engine import models
 from cvat.apps.engine.log import ServerLogManager
+from cvat.apps.engine.frame_provider import TaskFrameProvider
 from cvat.apps.engine.media_extractors import (
     MEDIA_TYPES, CachingMediaIterator, IMediaReader, ImageListReader,
     Mpeg4ChunkWriter, Mpeg4CompressedChunkWriter, RandomAccessIterator,
@@ -1499,6 +1500,9 @@ def _to_abs_frame(rel_frame: int) -> int:
     ):
         _create_static_chunks(db_task, media_extractor=extractor, upload_dir=upload_dir)
 
+    # Prepare the preview image and save it in the cache
+    TaskFrameProvider(db_task=db_task).get_preview()
+
 def _create_static_chunks(db_task: models.Task, *, media_extractor: IMediaReader, upload_dir: str):
     @attrs.define
     class _ChunkProgressUpdater: