Issue #3134349 by sleitner, yookoala, sharma.amitt16, Akram Khan, penyaskito, sahil.goyal, swatichouhan012, s_leu, larowlan, smustgrave, joachim: \Drupal\language\LanguageNegotiator does not handle PluginNotFoundException and break the site completely

Revert "Issue #3134349 by sleitner, yookoala, sharma.amitt16, Akram Khan, sahil.goyal, swatichouhan012, s_leu, penyaskito, smustgrave, joachim, larowlan: \Drupal\language\LanguageNegotiator does not handle PluginNotFoundException and break the site completely"

This reverts commit b279c994.

Issue #3134349 by sleitner, yookoala, sharma.amitt16, Akram Khan, sahil.goyal, swatichouhan012, s_leu, penyaskito, smustgrave, joachim, larowlan: \Drupal\language\LanguageNegotiator does not handle PluginNotFoundException and break the site completely

Issue #2457999 by Lendude, danflanagan8, dawehner, donquixote, alexpott, olli, jonathanshaw, Berdir, lokapujya, bfr, Peacog, dagmar, jibran, ayalon, lauriii, Nitesh Sethia, lzimmerman_jr, narendra.rajwar27, nevergone, geertvd, markpavlitski, sathish.redcrackle, plach, sharma.amitt16, tstoeckler, ciss, catch, jojonaloha: Cannot use relationship for rendered entity on Views

Issue #3111409 by mherchel, proeung, larowlan, alexpott, lauriii, Gábor Hojtsy, andrewmacpherson, catch, xjm, andypost, rahulrasgon, rabbitlair, mrconnerton, poojakural, boulaffasae, jerseycheese, shimpy, Indrajith KB, DuneBL, kiran.kadam911, komalkolekar, keboca, hawkeye.twolf, andrewozone, Maithri Shetty, alexdmccabe, sd9121, Sreenivas Bttv, katannshaw, mgifford, nod_, webchick, mtift, rainbreaw, Berdir, brianperry, thejimbirch, Dom., q0rban, nitesh624, hansa11, himanshu_sindhwani, kostyashupenko, shaktik, bnjmnm, sharma.amitt16, sonam.chaturvedi, steinmb, shaal, ressa, Ramya Balasubramanian, Sebacic, pradeepjha, tanmaykadam, thedrupalkid, vinitk, volkswagenchick, viappidu, vebrovski, Ujval Shah, Webbeh, Yuri, trebormc, msuthars, mrinalini9, bash247, chetanbharambe, ellenoise, anevins, andriyun, CocoM, JayKandari, ambuj_gupta, hussainweb, jhodgdon, Pooja Ganjage, ju.vanderw, jwitkowski79, MaxPah, Lokender Singh2, jponch, KarenS, KarinG, Lal_: Add new Olivero frontend theme to Drupal 9.1 core as beta; la...

Issue #3139440 by jungle, Hardik_Patel_12, siddhant.bhosale, sharma.amitt16, durgeshs: Replace usages of deprecated AssertLegacyTrait::buildXPathQuery()