[12.x] [meta] Deprecate dependencies, libraries, modules, and themes that will be removed from Drupal 12 core

Tarballs

• #3285191: [meta] Only support Drupal core installs managed by composer

Deprecation infrastructure

• #3039240: Create a way to declare a plugin as deprecated

JavaScript Dependencies

• #3076171: Provide a new library to replace jQuery UI autocomplete
• #2158943: Add a native dialog element to deprecate the jQuery UI dialog
• #3203920: Replace Contextual Links BackboneJS usage with VanillaJS equivalent

PHP dependencies

• Remove doctrine once #3396165: [meta] Convert all core plugin types to attribute discovery is complete
• Archive_Tar: Research whether the Archive_Tar dependency can be removed once Autoupdates is stable (needs issue)

Libraries

Modules

• Field Layout #3007167: [META] Enable layout builder for form displays, and deprecate field_layout
• Ban #3482198: [meta] Deprecate Ban module
• Toolbar #3484850: [meta] Deprecate Toolbar module

Experimental Modules

NA

Remaining tasks

• Add additional issues as appropriate.
• Evaluate in early 2023, again after 10.2.0-beta1, and again prior to 10.3.0-alpha1.