Handle HTTP Status 429 from quasi patch files

Problem/Motivation

Per #3061248-12: Package quasi-patch for automatic updates, we need to handle lazy generation of the patches.

Requesting arbitrary update combinations like https://www.drupal.org/in-place-updates/drupal/drupal-8.7.4-to-8.7.7.zip will now be recorded, and respond with an HTTP 429 and a Retry-After: 10 header.

Proposed resolution

At least in D8, guzzle has a means of handling these and possibly retrying the connection. Investigate that.

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet