Issue #3483050 by mstrelan, nicxvan: Add int return type to all hook_update_last_removed implementations

(cherry picked from commit 3d350b03)

Issue #3396166 by godotislate, berdir, quietone, bbrala, joachim, nicxvan, catch, kristiaanvandeneynde, larowlan: Convert entity type discovery to PHP attributes

(cherry picked from commit 45106a68)

(cherry picked from commit 9028e269)

(cherry picked from commit 7a8cfc7a)

(cherry picked from commit fa4cdaf3)

Issue #3483057 by mstrelan, bbrala, smustgrave: Add void return type to all hook_install and hook_uninstall implementations

Issue #3456601 by mstrelan, xjm, smustgrave, longwave: Add void return typehints to test helper methods

Issue #3473999 by mondrake, smustgrave, catch: Ajax-enabled image effect forms do not update to the latest ajax processed configuration

Issue #3083507 by oknate, jungle, quietone, neelam_wadhwani, longwave, xjm, tim.plunkett, smustgrave: Standardize "plugin ID" in doc comments instead of "plugin_id"

Issue #3462868 by annmarysruthy, yujiman85, nexusnovaz, pierregermain, ankitv18, sheetal-wish, smustgrave, lostcarpark, rodrigoaguilera, ultimike: Replace url usage of http://www.w3.org with https://www.w3.org in core

Issue #3470179 by catch, quietone: Account for test type, number of methods, and data providers in test ordering

Issue #3273099 by rkoller, jaydeep_patel, tinto, smustgrave: Fix several accessibility related issues on the edit Image style page

Issue #3467294 by quietone, nod_, smustgrave, catch, longwave: Change string 'Modules to enable' to {@inheritdoc} in comments

Issue #3465602 by catch, quietone, smustgrave: Order tests by number of public methods to optimize gitlab job times

Issue #3458422 by mstrelan, smustgrave: Add string return typehints to protected test helper methods

Issue #2909371 by mfernea, quietone, zaporylie, smustgrave: Fix 'Drupal.Commenting.VariableComment.VarOrder' coding standard

Issue #3303127 by phenaproxima, thejimbirch, alexpott, Wim Leers, nedjo, b_sharpe, laura.j.johnson@gmail.com: Determine which core config entity methods should be config actions

Issue #3421418 by mstrelan, Spokje, xjm, mondrake, longwave, acbramley: Add void return typehints to all test methods

Issue #3180696 by Spokje, Nikolay Shapovalov, adamzimmermann, quietone, manish-31, xjm, SuperfluousApostrophe, smustgrave, jonathan1055, longwave: Fix 'Drupal.Commenting.TodoComment' coding standard

Issue #3172550 by bradjones1, DuaelFr, alexpott, smustgrave, longwave: Register Drupal's mime type guesser the Symfony MimeTypes service

Issue #3057070 by joachim, Pancho, nicxvan: Refactor ImageFieldCreationTrait to support entity types other than nodes

Issue #3420981 by kim.pepper, quietone, mstrelan, Berdir, alexpott: Convert FieldType plugin discovery to attributes

Issue #3443300 by mondrake: Fix remaining return*() methods of class PHPUnit\Framework\TestCase deprecated in PHPUnit 10

Issue #3439981 by fago, ericgsmith, petar_basic, acbramley: Uploading a file to media library flushes theme registry

Issue #3440038 by longwave, quietone, mondrake, catch: ImageItem logs an warning instead of triggering an E_USER_WARNING

Issue #3324560 by alexpott, mstrelan, dimitriskr, xjm, longwave, catch: Replace strpos/substr with str_starts_with() / str_contains() / str_ends_with()

Issue #2786735 by recrit, eiriksm, ranjith_kumar_k_u, immaculatexavier, ravi.shankar, zaporylie, smustgrave, TrevorBradley, johnle, GaëlG, jefuri, alexpott, poker10: Image derivative generation does not work if effect "Convert" in use and file stored in private filesystem

Issue #3426506 by kim.pepper, smustgrave, mstrelan, alexpott: Create enums for File exists options and deprecate consts

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