Revert "Issue #3038365 by acbramley, Grimreaper, smustgrave, catch: Add owner to the BlockContent entity type"

This reverts commit b8d5c0e4.

Issue #3038365 by acbramley, Grimreaper, smustgrave, catch: Add owner to the BlockContent entity type

Issue #2949939 by azinck, cgoffin, AlexKirienko, Grimreaper, SpadXIII, joseph.olstad, jecunningham2281, dewalt, andypost: The latest_revision ViewsFilter has poor performance

Issue #2997790 by mohit_aghera, Keenegan, Grimreaper, lozsmile, catch, angrytoast: Set MenuLinkContent getEntity to public visibility

Issue #1975064 by smustgrave, tanc, ravi.shankar, seanpclark, pixlkat, wengerk, meena.bisht, cboyden, rjg, klaasvw, nikitagupta, larowlan, MaskOta, mlncn, dsnopek, fenstrat, fago, vacho, yobottehg, Grimreaper, rpayanm, B-Prod, SKAUGHT, rkoller, yoroy, stefan.r, psf_, AaronMcHale, rootwork, ifrik, TravisCarden, stella, kae76, josephdpurcell@gmail.com, eelkeblok, andypost, benjifisher: Add more granular block permissions

Issue #3061266 by smustgrave, Grimreaper, ridhimaabrol24, nod_, pavnish, ithom, Hardik_Patel_12, Webbeh, alexpott: Prefix block machine name suggestions with the theme machine name

Issue #3083561 by Grimreaper, raman.b, ankithashetty, mglaman, bbrala, Wim Leers, quietone: Add explicit test coverage for JSON:API filtering on a datetime field

Issue #2359675 by Grimreaper, jhedstrom, paulocs, anrikun, Lendude, larowlan, nicoloye, dww, alexpott: File field's Maximum upload size always passes validation

Issue #2982684 by greg.1.anderson, Mile23, Mixologic, webflo, alexpott, yogeshmpawar, pingwin4eg, vijaycs85, larowlan, dww, borisson_, phenaproxima, kim.pepper, bojanz, grasmash, hctom, kmbremner, pingers, Jax, sherakama, derhasi, claudiu.cristea, jhedstrom, Xano, Grimreaper: Add a composer scaffolding plugin to core

Issue #3042124 by gabesullice, Wim Leers, logickal, benjy, Grimreaper: [regression] Empty response body when user is an administrator and an exception is thrown; some traces cannot be encoded because of recursion detection

Issue #2843147 by Wim Leers, e0ipso, gabesullice, dagmar, xjm, effulgentsia, webchick, dww, Berdir, dawehner, colan, mgalalm, govind.maloo, das-peter, jludwig, ndobromirov, martin107, abhisekmazumdar, nuez, catch, amateescu, pwolanin, mallezie, borisson_, jibran, voleger, plach, GeduR, Grimreaper, apupiales, Sutharsan, RenatoG, michaellander, sergesemashko, dbt102, hampercm, dremy, rpayanm, chriscalip, tstoeckler, keopx, skyredwang, Spleshka, RajeevK, matthew.perry, kaysenlau, jazzdrive3, dsdeiz, ebeyrent, acbramley, deviantintegral, samuel.mortenson, DamienMcKenna, mohit_aghera, ibustos, dpolant, garphy: Add JSON:API to core as a stable module

Issue #2950709 by idebr, Grimreaper: ConfigSync.php tries to include non-existing file config.admin.inc

Issue #2543726 by damiankloip, Wim Leers, claudiu.cristea, voleger, dagmar, dawehner, amateescu, tedbow, FredCorreia, mgalalm, caseylau, jibran, dbjpanda, pcambra, Grimreaper, idebr, dmouse, larowlan, Berdir, chx, andypost, yched, fgm: Make $term->parent behave like any other entity reference field, to fix REST and Migrate support and de-customize its Views integration

Issue #2932369 by marcoscano, balsama, Berdir, Grimreaper, alexpott: Media Types missing access control handler result in empty column in media overview page

Issue #2212869 by hellboy2k8, leevingo, naveenvalecha, Grimreaper, subhojit777, poojasharmaece, kellyimagined, ZeiP, kostyashupenko, andypost, jibran: Extend ContactAuthenticatedUserTest for anonymous user

Issue #2782221 by Grimreaper, dawehner, Lendude, alexpott: Result summary Area plugin not displayed when there is no result

Issue #2011066 by Grimreaper, esbandeira, joshi.rohit100, the_contributor: example_author from hook_node_grants/hook_node_access_records grants all anon edit/delete to uid=0 nodes

Issue #2179903 by Grimreaper, jahaimon, InternetDevels | YesCT: Fixed testDeleteLink() in ViewEditTest with use correct use (not Drupal\views\Plugin\Core\Entity\View) and assertTrue before assertFalse.