Contrib: Merge branch 3.1.x into 3441577-core-mr - project/automatic_updates@33b7e949

Contrib: Revert "This is actually an intersection type, not a union type, because it is BOTH ExecutableFinderInterface and ObjectProphecy." - project/automatic_updates@8a6fd971

Contrib: first checkout test to be patched - project/automatic_updates@2142aa7f

Contrib: update minimum stager version - project/automatic_updates@c6a3e784

Contrib: restore gitlab" - project/automatic_updates@6830afaa

Issue #3442530 by smustgrave, andypost, quietone: Update contextual module deprecation for removal in 12.0

Issue #3420981 by kim.pepper, quietone, mstrelan, Berdir, alexpott: Convert FieldType plugin discovery to attributes

Issue #3442713 by smustgrave, catch, Binoli Lalani, longwave: Remove deprecated code from the entity system

Issue #3443037 by alexpott, catch, kristiaanvandeneynde, Taran2L, longwave: Super user access policy and the installer

Issue #3442259 by catch, quietone, dww: Reduce time of Migrate Upgrade tests by not outputting the logs by default

Issue #3442162 by catch, smustgrave: Remove redundant hook_ENTITY_TYPE_presave() and ViewsConfigUpdater methods

Issue #3443211 by nicxvan, smustgrave: Update cspell.json to remove references to extensions no longer in core

Issue #3443300 by mondrake: Fix remaining return*() methods of class PHPUnit\Framework\TestCase deprecated in PHPUnit 10

Issue #3442976 by smustgrave, andypost: Remove deprecations from ckeditor5, editor, and filter modules

Issue #3369099 by longwave, mondrake, smustgrave: [PHPUnit 10] Provide a static alternative to @dataproviders using PHPUnit mocks in ProtectedUserFieldConstraintValidatorTest

Issue #3443248 by alexpott: Can't log out on translated site in tests - causes issues for 10.3 umami test

This reverts commit a879c616.

Issue #3423920 by DanielVeza, smustgrave, acbramley, bradallenfisher, larowlan, alexpott: Custom Blocks with Layout Builder Enabled No Longer Use Front End Theme

Issue #3442864 by dww, catch: [regression] 404 for misc/throbber-active.gif / misc/loading-small.giff

Issue #3439981 by fago, ericgsmith, petar_basic, acbramley: Uploading a file to media library flushes theme registry

Issue #3414398 by catch, Berdir: AssetResolver::getJsAssets() and AssetResolver::getCssAssets()  can repeatedly try to calculate the same set of assets