Support product revisions from Commerce v1

Problem/Motivation

Once Commerce supports production revisions ( 📌 Add revision support to products Needs work ) add revision support to migrated data.

Proposed resolution

Add revision support to Commerce v1 product display (node -> Commerce 2 Product entity) migrations.
Add test coverage to product display revisions.
Add revision support to Commerce v1 product (product -> Commerce 2 ProductVariation entity) migrations.
Add test coverage to product displays.

Remaining tasks

Add revision support to Commerce v1 product display (node -> Commerce 2 Product entity) migrations.
Add test coverage to product display revisions.
Add revision support to Commerce v1 product (product -> Commerce 2 ProductVariation entity) migrations.
Add test coverage to product displays.

User interface changes

n/a

API changes

TBD

Data model changes

n/a