Sync always touches every collection version docs-blob

Repo synctest with 207 collection versions exists on ci.cloud.redhat.com

1st sync yields:

• ~500 log msg of pulp_ansible.app.downloaders:INFO: Updating bearer token
• 207 log msg of pulp_ansible.app.tasks.collections:INFO: Reading MANIFEST.json from artifact ...

Then added 1 collection / 1 collection version to ci.cloud repo

2nd sync yields:

• at least 300 log msg of pulp_ansible.app.downloaders:INFO: Updating bearer token
• 208 log msg of pulp_ansible.app.tasks.collections:INFO: Reading MANIFEST.json from artifact ...
• 6 minutes of syncing

Expected 2nd sync to yield:

• much less log msg of pulp_ansible.app.downloaders:INFO: Updating bearer token
• maybe 1 log msg of pulp_ansible.app.tasks.collections:INFO: Reading MANIFEST.json from artifact ...
• much shorter duration

Note - not sure if these expectations are correct or not.