Issue #3253735: Backbone manual tree-shake

Issue #3252214 by Spokje: Move tests for integrations between QuickEdit and CKEditor5 into QuickEdit so that it can more easily be moved into contrib

Issue #2886615 by scott_euser, clemens.tolboom, quietone, joachim, alexpott, Lendude: comment_empty_title_test has invalid hook

Issue #3104353 by xjm, TravisCarden, andypost, kim.pepper, longwave, Taran2L, tedbow, catch, alexpott: Upgrade to Guzzle 7

Issue #3239500 by hooroomoo, bnjmnm, lauriii: Add Array.includes polyfill to support IE11 and Opera Mini

Issue #2871357 by alexpott, kriboogh: Installer tasks using multiple batch sets in non-interactive mode do not get executed

Issue #3198010 by mcdruid, acbramley, mstrelan, quietone, manojithape, vikashsoni, chetanbharambe, sarguna raj M, larowlan, alexpott: User login page broken when there are more than 5 failed login attempts for an account

Revert "Issue #3251936 by Gábor Hojtsy, Mixologic, longwave: Make DrupalCI read Drupal 10 drupalci.yml"

This reverts commit b5d9d233.