Replace existing Feature Flags with a single of OPS type

Merged Aleksei Lipniagov requested to merge 266986-update-img-resizing-ffs into master

What does this MR do?

Implements #266986 (closed)
We want to keep a single Feature Flag for Image Resizing, and it will be an OPS type, as we expect to keep it for a longer time (at least until 13.7).

Does this MR meet the acceptance criteria?

Conformity

Availability and Testing

Security

N/A

Related to #266986 (closed)

Edited by Aleksei Lipniagov