fix: prevent soft-deletes from being re-published every time

[ormsbee]

Details are in a comment from this change:

        # Account for soft-deletes:
        # NULL != NULL in SQL, so simply excluding entities where the Draft
        # and Published versions match will not catch the case where a
        # soft-delete has been published (i.e. both the Draft and Published
        # versions are NULL). We need to explicitly check for that case
        # instead, or else we will re-publish the same soft-deletes over
        # and over again.

[ormsbee]

@pomegranited or @navinkarkera: Review if one of you has time, please?

[navinkarkera]

@ormsbee Looks good. 👍

• I tested this: Published library with soft deleted components and verified that they are not included in the publish log records.
• I read through the code
• Includes documentation