ContextDefinition::isSatisfiedBy does not take into account cardinality

Problem/Motivation

ContextDefinition::isSatisfiedBy does not check if the definition is multi-valued. This can cause an error when checking violations.

Steps to reproduce

The following code produces an error.

$definition = EntityContextDefinition::create('node');
$definition->setMultiple();

$nodes = Node::loadMultiple([1, 1]);
$context = new \Drupal\Core\Plugin\Context\Context($definition, $nodes);

$satisfied = $definition->isSatisfiedBy($context);

Error: Call to a member function getEntityTypeId() on array in Drupal\Core\Entity\Plugin\Validation\Constraint\EntityTypeConstraintValidator->validate() (line 22 of /var/www/html/web/core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/EntityTypeConstraintValidator.php).

Proposed resolution

Check $definition->isMultiple() inside of ContextDefinition::isSatisfiedBy and tweak how $validator->validate() runs.

Remaining tasks

Write a patch.

User interface changes

n/a

API changes

n/a

Data model changes

n/a

Release notes snippet

n/a