Ansible Plugin

Add is_highest field to CollectionVersion model

is_highest is a boolean field that indicates if a specific collection version has the highest version in a set of available collection versions. This patch adds the field, migration and data migration for it.

NOTE: Since the semver comparison is implemented in Python, data migration fetches all required data into memory. Even considering limited number of fields that queries fetch, the operation may have impact on performance or even fail if out of memory.

https://pulp.plan.io/issues/5223 closes #5223