Revert "Issue #3072312 by jhodgdon, Amber Himes Matz, andypost, webchick: Review/fix/delete existing help topics"

This reverts commit 24a6e3d3.

Issue #3072312 by jhodgdon, Amber Himes Matz, andypost, webchick: Review/fix/delete existing help topics

Issue #3016471 by Gábor Hojtsy, drumm, tedbow: Make localization file download major version agnostic

Issue #3086408 by Krzysztof Domański, mglaman, el7cosmos: Error code should be string in HttpExceptionNormalizer

Issue #2930050 by quietone: Remove destination property content_translation_update_definitions from migrations

Issue #3066954 by andrewmacpherson, Wim Leers, bnjmnm, OBKev: Admin toolbar not usable with latest versions of JAWS due to mis-use of aria-owns

Issue #3087626 by greg.1.anderson, Mixologic, jibran, Mile23, alexpott, xjm: Convert drupal/core-recommended & c. into a subtree split

Issue #3087531 by alexpott, jibran, gnikolovski, xjm, Mixologic: Use Diactoros LTS version 1.7, not 1.8 which is out of security coverage

This reverts commit a0539080.

Issue #3087518 by kim.pepper: Remove references to queryAddPage() in comments and deprecation notices

Issue #2233595 by amateescu, marcingy, SpartyDan, visabhishek, Sharique, carletex, slashrsm, hanoii, plach, Berdir, xjm: Deprecate the custom path alias storage

Issue #3089752 by bnjmnm, zrpnr: Follow-up to #3074267 Refactor use of classList in quickedit for browser compatibility

Issue #3083570 by huzooka, shashikant_chauhan, rensingh99, ckrina, katannshaw, shimpy, andrewmacpherson, mfairchild365: Do not hide the label for the text format select input

Issue #3089697 by alexpott, swentel: Regression due to File::setValidationRequired in _file_save_upload_single()

Issue #3088447 by Mile23, heddn, Krzysztof Domański: BuildTestBase->standUpServer always starts new server

Issue #3075645 by chr.fritsch, maacl, super_romeo, volkerk, alexpott: temporary://update-cache-60b12ec6 is not a directory. in FileSystem->scanDirectory()

Issue #3085062 by jibran, amateescu, larowlan, xjm, Berdir: Declare a conflict on pathauto versions that aren't compatible with 8.8.0

Issue #3088853 by alexpott, mondrake: Require typo3/phar-stream-wrapper ^3.1.3 and pear/archive_tar ^1.4.8 in order to support PHP 7.4

Issue #2905429 by zrpnr, tim.plunkett, Wim Leers, Jacine: Library definitions containing only dependencies should be valid

Issue #3089168 by phenaproxima, bnjmnm: Remove or reduce representational CSS classes in all Media Library tests

Issue #3088369 by mikelutz, alexpott, Berdir, Gábor Hojtsy, andypost, martin107, greg.1.anderson, dawehner, jibran, Wim Leers, Mile23, catch: Update Drupal 9 to Symfony 4.4-dev

Issue #3088681 by phenaproxima, seanB, bnjmnm, lauriii: Make MediaLibraryTest less dependent on representational CSS selectors

Issue #3088448 by alexpott, greg.1.anderson, Mixologic, Mile23: Remove bin/composer from composer.lock file