Draft: task: #3601481 Deprecate extension pathname APIs in favor of path-based lookups

Andrey Postnikovrequested to merge
issue/drupal-3601481:3601481-deprecate-extension-pathname into main

Deprecate the single-extension pathname accessors in favour of the path-based APIs:

  • ExtensionList::getPathname() - use ::getPath() for the extension directory or ::getPathNames() for the .info.yml path.
  • ExtensionPathResolver::getPathname() - use ::getPath().

Rework ExtensionList::getPath() and ExtensionPathResolver::getPath() to resolve directly instead of delegating through the deprecated getPathname(), and make ExtensionList::getPathNames() return manually added pathnames merged with the calculated map. Update callers and tests to the non-deprecated APIs and add focused deprecation coverage.

Closes #3601481

Merge request reports