ThemeAwareSingleDirectoryComponentDiscovery constructor mismatch with canvas module — missing PropShapeRepositoryInterface argument

Problem/Motivation

The canvas_bootstrap module's
ThemeAwareSingleDirectoryComponentDiscovery class fails to
instantiate when the canvas module is installed, because its
constructor does not pass a required PropShapeRepositoryInterface
argument when creating the inner
SingleDirectoryComponentDiscovery object.

The canvas module updated
SingleDirectoryComponentDiscovery::__construct() to require
PropShapeRepositoryInterface as its first parameter, but
canvas_bootstrap's ThemeAwareSingleDirectoryComponentDiscovery
was not updated to match. This results in a fatal error at runtime when
the canvas component discovery service is resolved from the container.

Steps to reproduce

1. Install both drupal/canvas and drupal/canvas_bootstrap.
2. Enable both modules.
3. Visit any page that triggers the canvas component plugin manager (e.g. a
   page using a layout with canvas components, or by clearing caches).
4. Observe a fatal PHP error:
   
   Too few arguments to function SingleDirectoryComponentDiscovery::__construct()
   (or an ArgumentCountError / type mismatch depending on PHP version).

Proposed resolution

Update ThemeAwareSingleDirectoryComponentDiscovery to:

1. Add use Drupal\canvas\PropShape\PropShapeRepositoryInterface; to the imports.
2. Inject PropShapeRepositoryInterface as the first constructor argument (matching the updated SingleDirectoryComponentDiscovery signature).
3. Pass $this->propShapeRepository as the first argument when constructing the inner SingleDirectoryComponentDiscovery instance.
4. Resolve PropShapeRepositoryInterface::class from the container in the create() factory method.

Remaining tasks

• Review and commit the patch.
• Add a regression test that verifies the service can be instantiated
  when both canvas and canvas_bootstrap are enabled.

User interface changes

None.

API changes

The constructor signature of
ThemeAwareSingleDirectoryComponentDiscovery gains a new required
first parameter: PropShapeRepositoryInterface $propShapeRepository.
Any code instantiating this class directly (outside the container) will
need to be updated to pass this argument.

Data model changes

None.