#14964 Backport Delivery API member auth from V14

#13525 Make PublishedSnapshotService more performant for large websites

#14903 Remove broken reference to submodule

#14880 Replaced `[MaybeNullWhen(false)]` with `[NotNullWhen(true)]` for `UdiParser.TryParse` method

#14847 Fix spelling mistake, and add details of additional packages

#14837 Fixes: Menu tab missing `data-element="tab-{{tab.alias}}"` in the dropdown list

#14761 Add SetMemberSignInManager builder extension

#14663 Improving intellisense by fixing XML warnings

#13500 Allow to specify format and parsing format in dateHelper functions

#14942 Corrected mark-up in the logviewer

#14905 Add IExceptionHandlerFeature check to dynamic route check

#14892 Fix for fallback file upload

#14846 Ensure focus on specific action in block card

#14816 Remove duplicate name attribute in 2FA login form

#14803 Bug fix whre mediapicker dont load before an event fires elsewhere #1…

#14781 add Audit Trail to the media info tab just alike the conten

#14778 Update Members list view, enable search by id or key

#14765 Update Media list view, search by id or key

#15065 V12: Bump @umbraco-ui/uui from 1.4.0 to 1.5.0

#15043 Check content permissions before performing action

#15032 Bugfix: UI for preview bug related to single language & non variant content

#14994 V12: Update Backoffice dependencies: jQuery, TinyMCE, SignalR, Ace Editor, Umbraco UI Library

#14987 Delivery API: Create matcher policy to pick the correct item endpoint

#14978 Updated Welsh lang file

#14967 Add config to limit concurrent logins

#14966 Out-of-date models status flag is created when using SourceCodeManual and Development Runtime

#14947 Fixed a couple of occurrences where scopes was auto-completed while modified db state

#14937 Fix custom dbcontexts extention methods

#14927 Updated Dutch translation for "import"

#14904 Add aria label to umbraco property

#14895 Translate 'noItemsFound' to Dutch

#14884 made link to umbraco learning base youtube visible with underline sty…

#14881 Fixed URL tracking not working for invariant pages with culture variant ancestors

#14867 Make sure to sign out external users if an error occurs during sign-in

#14852 Only use EF DbContext Pool when Runtime level = Run

#14839 Ensure that value type JSON is translated correctly for Delivery API output

#14824 Fix property variance cache issue

#14805 API examinemanagement/GetIndexerDetails throws 500 when an index is corrupt

#14799 a11y improvement for settingsdashboardintro

#14794 added validation messages in swedish language

#14773 Feature: Add buttons for additional preview URLs

#14767 Fixes #14722 - DateTime picker calendar does not get updated when custom date format

#14759 Issuu embed does not work

#14750 Fixes: #14486 - Some sr-only texts not localized

#14725 Update umbBlockGridPropertyEditor.component.js

#14694 ModelsBuilder GetModelPropertyType fails when the "itemType" is "Element"

#14620 Fixes #14351 - Using Fallback to default langauge on a specific item changes the whole VariationContext

#13074 Add dropdown prevalue editor

#13073 Cleanup radiobuttonlist prevalue editor