As a user I should be able to sync only images with digest

[pranavkumar74980]

I am trying to synchronize container images, but I cannot find an option to filter images using SHA256 digests.
Example:
gcr.io/knative-releases/knative.dev/serving/cmd/controller@sha256:b11dbcba050eac9084edd021b7e0eee16b39c9e397b245bc4227266af1893404

For tagged images, I can successfully use the --include-tag or --exclude-tag filter options to filter specific tags. However, the same approach does not work for SHA256 digests.

Steps to Reproduce

Run the following command to create a container remote:

pulp container remote create --name name_remote --url https://gcr.io --upstream-name knative-releases/knative.dev/serving/cmd/controller --policy on_demand

Attempted to filter the image using --include-tag :

--include-tag '["b11dbcba050eac9084edd021b7e0eee16b39c9e397b245bc4227266af1893404"]'
--include-tag '["@sha256:b11dbcba050eac9084edd021b7e0eee16b39c9e397b245bc4227266af1893404"]'
--include-tag '["sha256:b11dbcba050eac9084edd021b7e0eee16b39c9e397b245bc4227266af1893404"]'
--include-tag '["sha256-b11dbcba050eac9084edd021b7e0eee16b39c9e397b245bc4227266af1893404"]'

Run a sync operation.

Observed Behavior
None of the above variations of the --include-tag filter work when targeting SHA256 digests.
The sync operation completes successfully but does not filter the specified image.
If no --include-tag filter is specified, the image is successfully pulled.

Expected Behavior
The --include-tag or a similar filter should allow filtering by SHA256 digests.

Additional Notes
This issue is not documented in the official Pulp documentation.
Filtering by tags works as expected, but filtering by digests does not.