This reverts commit 5a9ce8cf.

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

Issue #3386458 by catch, quietone, alexpott, larowlan: Add GenericModuleTestBase and use it to test general module things

Issue #3379991 by kristiaanvandeneynde, BramDriesen: Adjust variation_cache.dynamic_page_cache declaration to follow suit

Issue #2551419 by kristiaanvandeneynde, catch, dawehner, Wim Leers, borisson_, bradjones1, tstoeckler, andypost: Abstract RenderCache into a separate service that is capable of cache redirects in a non-render array-specific way

Issue #3232097 by daffie, longwave: [Symfony 6] Add "array" type hint to methods overriding Symfony\Component\EventDispatcher\EventSubscriberInterface::getSubscribedEvents()

Issue #3139409 by mondrake, nitesh624, ridhimaabrol24, shobhit_juyal, mohrerao, Hardik_Patel_12, paulocs, ravi.shankar, munish.kumar, mrinalini9, alexpott: Replace usages of AssertLegacyTrait::assertRaw, that is deprecated

Revert "Issue #3139409 by mondrake, nitesh624, ridhimaabrol24, shobhit_juyal, mohrerao, Hardik_Patel_12, ravi.shankar, munish.kumar, mrinalini9, alexpott: Replace usages of AssertLegacyTrait::assertRaw, that is deprecated"

This reverts commit 71e8db19.

Issue #3139409 by mondrake, nitesh624, ridhimaabrol24, shobhit_juyal, mohrerao, Hardik_Patel_12, ravi.shankar, munish.kumar, mrinalini9, alexpott: Replace usages of AssertLegacyTrait::assertRaw, that is deprecated

Issue #2851394 by GoZ, hgunicamp, oknate, jungle, wolffereast, tameeshb, mmatsoo, ridhimaabrol24, jofitz, swarad07, tanc, shaktik, dimaro, shashikant_chauhan, MerryHamster, quietone, nitesh624, martin_q, boaloysius, gaurav.kapoor, nitvirus, ankithashetty, Munavijayalakshmi, kostyashupenko, leolando.tan, amit.drupal, ravi.shankar, akashkrishnan01, Swapnil_Kotwal, Saviktor, mrinalini9, anmolgoyal74, Venkatesh Rajan.J, shimpy, lomasr, Dinesh18, shubham.prakash, mahtab_alam, markdorison, cilefen, longwave, bleen, xjm, alexpott, gmaltoni: Fix grammar 'a' to 'an' when necessary

Issue #3131186 by mondrake, Vidushi Mehta, longwave, paulocs, xjm: Replace assertions involving calls to drupalGetHeader() with session-based assertions, where possible

Issue #3094398 by martin107, alexpott, andypost, klausi: Update Symfony response and request events to new classes

Issue #3107732 by mondrake, longwave, swatichouhan012, salah1, xjm, catch, alexpott, Berdir: Between April 13 and April 17, 2020: Add return typehints to setUp/tearDown methods in concrete test classes

Issue #2570985 by ifrik, chipway, lomasr, jhodgdon, shimpy, govind.maloo, vacho, Balu Ertl, Manjit.Singh, alexpott, Bojhan, volkswagenchick, mradcliffe, xjm, tkoleary, yoroy, no_angel, dawehner, webchick, Sam152, RuslanP, Gábor Hojtsy, wengerk, wla_g: Update the module descriptions on the Extend page

Issue #3114785 by slootjes, longwave: [Symfony 5] Update deprecated short factory configurators in Yaml

Issue #2742585 by ZeiP, alexpott, mondrake, klausi, tomasnagy, Krzysztof Domański, sokru, kristiaanvandeneynde, dawehner, jeroenbegyn: Deprecate dangerous assertTrue/False() compatibility overrides in PHPUnit Kernel, Functional and FunctionalJavascript tests

Issue #3082655 by Wim Leers, alexpott, iyyappan.govind, dww, lauriii: Specify the $defaultTheme property in all functional tests

Issue #3072702 by alexpott, Wim Leers, mikelutz, xjm, catch, Berdir, tedbow, webchick, shaal, Mixologic, heddn: Core extensions should not need to specify the new core_version_requirement in *.info.yml files so that 9.0.x can be installed

Issue #2575841 by nicrodgers, znerol, Utkarsh_Mishra, MerryHamster, markdorison: Use proper method name in DynamicPageCacheSubscriber

Issue #2877136 by Wim Leers, alexpott: dynamic_page_cache.module has an incorrect and misleading @file doc

Issue #2835626 by 20th, vijaycs85, himanshu-dixit, naveenvalecha, Jo Fitzgerald, Wim Leers, xjm, dawehner, catch, alexpott: Rename & document Drupal\Core\EventSubscriber\AcceptNegotiation406 KernelEvents::VIEW event subscriber

Issue #2776975 by joelpittet, dawehner, tim.plunkett, xjm, pfrenssen: March 3, 2017: Convert core to array syntax coding standards for Drupal 8.3.x RC phase

Issue #2770921 by dawehner, klausi, Mile23, mpdonadio, xjm, claudiu.cristea: Feb 21st: Convert chunk of WTB to BTB by just moving classes, changing use statements adding traits

Issue #2759247 by Wim Leers: Request attribute removed from DynamicPageCacheSubscriber, but comment was not updated

Issue #2744379 by juampynr: Fix typos in documentation of \Drupal\dynamic_page_cache\EventSubscriber\DynamicPageCacheSubscriber

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2600538 by rakesh.gectcr, anil280988, justAChris, jhodgdon: Incorrect @file description in core/ classes - wrong namespace or class name

Issue #2488032 by jhodgdon, opdavies, ifrik, webchick, Berdir: Integrate help test into module uninstall test

Issue #2560783 by stefan.r, joelpittet, lauriii, Cottser, Sutharsan, kgoel, justAChris, Gábor Hojtsy, dawehner, jhodgdon, effulgentsia, xjm, andypost, googletorp: Replace !placeholder with :placeholder for URLs in hook_help() implementations

Issue #2429617 by Wim Leers, Fabianx, Berdir, yched, dawehner, effulgentsia, catch, borisson_, jhodgdon, martin107, torgosPizza: Make D8 2x as fast: Dynamic Page Cache: context-dependent page caching (for *all* users!)