Issue #3439892 by SolimanHarkas, pradhumanjain2311, vensires: Fix Language tests that rely on UID1's super user behavior

This reverts commit 5a9ce8cf.

Issue #540008 by kristiaanvandeneynde, Spokje, daffie, clayfreeman, alexpott, eelkeblok, michaelfavia, ianthomas_uk, zaporylie, johnwebdev, abhisekmazumdar, anmolgoyal74, greggles, quietone, shaal, catch, rivimey, AaronMcHale, Berdir, ndf, xjm, finne, Wim Leers, esolitos, heddn, webchick, Bojhan, andypost, efpapado, benjifisher, lauriii, Gábor Hojtsy, moshe weitzman, harings_rob: Add a container parameter that can remove the special behavior of UID#1

Issue #3421016 by quietone, godotislate: Convert MigrateProcessPlugin plugin discovery to attributes

Issue #2575105 by Berdir, catch, longwave, quietone, kristiaanvandeneynde, andypost, alexpott, mathilde_dumond, pradhumanjain2311, amateescu, Wim Leers, xjm: Use cache collector for state

Issue #3431452 by godotislate, smustgrave, alexpott: Rename RenderElement and FormElement plugin abstract classes to RenderElementBase and FormElementBase

Issue #3433088 by mondrake, Spokje: Method getMockForAbstractClass() of class PHPUnit\Framework\TestCase is deprecated in PHPUnit 10 - Step 1 interfaces

Issue #3421439 by godotislate, sorlov, quietone, smustgrave, alexpott, larowlan, longwave, andypost: Convert form and render element plugin discovery to attributes

Issue #3433052 by mondrake: Fix remaining return*() methods of class PHPUnit\Framework\TestCase deprecated in PHPUnit 10

Issue #3109970 by znerol, andypost, Prashant.c, daffie, Wim Leers, dww, catch: Convert uses of $_SESSION in forms and batch

Issue #3426309 by Wim Leers, smustgrave: Add config validation for weights (blocks, filters, etc. all use weights)

Issue #2926070 by smustgrave, dimitriskr, andypost, gnuget, zahord, yogeshmpawar, MerryHamster, kim.pepper, alexpott, Mile23, daffie, larowlan: Deprecate ModuleHandlerInterface::getName()

Issue #3421017 by mohit_aghera, smustgrave: Convert LanguageNegotiation plugin discovery to attributes

Issue #3420986 by kim.pepper, sorlov, larowlan, mstrelan: Convert Condition plugin discovery to attributes

Issue #2613222 by webflo, alexpott, ameymudras, pooja saraah, _utsavsharma, penyaskito, Janvi Dasani: Language module shouldn't alter config in sync mode

Issue #3401730 by kim.pepper, smustgrave, longwave: Add default autoconfigure to all *.services.yml and remove event_subscriber tags

Issue #3414165 by quietone, shalini_jha, adwivedi008, longwave: Use "install" not "enable" for modules in strings

Issue #3353210 by mondrake, PrabuEla, Spokje: [PHPUnit 10] @dataProvider methods must be declared static and public

Issue #3382581 by phenaproxima, borisson_, larowlan, Wim Leers, quietone: Add new `EntityBundleExists` constraint

Issue #3385550 by lauriii, Gauravvvv, sboden, Shabbir, longwave: Language negotiation breaks updating Drupal 9 to 10

Issue #2507237 by dimitriskr, twistor, longwave, smustgrave: Replace ReflectionClass::implementsInterface() with is_subclass_of()

Issue #3384936 by marvil07, vbouchet, smustgrave, xjm, joachim: Use the API to set up languages in tests that are not specifically testing the language form

Issue #3404273 by mstrelan, smustgrave: Fix strict type errors: Convert FormattableMarkup to strings (simple replacement) in core Functional tests

Issue #2484991 by znerol, voleger, andypost, dww, anmolgoyal74, markdorison, ankithashetty, larowlan, daffie, alexpott: Add the session to the request in KernelTestBase, BrowserTestBase, and drush

Revert "Issue #2484991 by znerol, voleger, andypost, dww, anmolgoyal74, markdorison, ankithashetty, daffie, alexpott, larowlan: Add the session to the request in KernelTestBase, BrowserTestBase, and drush"

This reverts commit 48a7cf12.

Issue #2484991 by znerol, voleger, andypost, dww, anmolgoyal74, markdorison, ankithashetty, daffie, alexpott, larowlan: Add the session to the request in KernelTestBase, BrowserTestBase, and drush