Bug fixes

Fixing the summary to work with empty cart or even not existing one.

Fixes compatibility issues with Drupal 8.7

Fixed

#3053035: Import and Populate Reference fail with error on Drupal 8.7

First beta release.
Includes:

In this release:
#3040343: Deploy to archived workspace fails
#3042788: Drupal 9 Deprecated Code Report
Bug fixes.

In this release:
#3022511: Improving a handling replication status in queue worker
#3028296: Default settings for adding workspace
Initital work on selective content deployments support.
Other minor fixes.

This release is a follow-up to the previous release, it contains only tests fixes (#3053336: Fix failing test).