Conversion of compositor node tree to operation is done in a job thread,
and the main thread might modify the image data-block at the same time.
This change fixes it by making it so compositor uses acquire/release
semantic for the image data-block, and making it so the image locks its
render result, preventing other threads from modifying it.
Ref #121761
Pull Request: https://projects.blender.org/blender/blender/pulls/122105
cccc1ea0eb