[PAP] Product filter with "category_id: {in: [...]}" does not work as expected

[magento-engcom-team]

Steps to reproduce:

• Create 2 categories with 1 product each
• run query to fetch products in those categories

{
  products(filter: {category_id: {in: <"<cat1>", "<cat2>">}}) {
    items {
      sku
      name
    }
    total_count
  }
}

Expected:
total_count should be 2, and items should contain 2 products

Actual:
total_count is 2, but items only contains 1 products

Some investigation:
Changes to \Magento\CatalogGraphQl\Model\Resolver\Products\SearchCriteria\CollectionProcessor\FilterProcessor\CategoryFilter::apply() cause the product collection to be filtered by only the last category id in the array used for "in".
see $collection->addCategoryFilter($category); on line 64

Tests failed to catch this because they check total_count but not actual count of items
need to fix test: \Magento\GraphQl\Catalog\ProductSearchTest::testFilteringForProductsFromMultipleCategories()

[magento-engcom-team]

The issue was exported from the internal JIRA. The link to the original JIRA issue: https://jira.corp.magento.com/browse/MC-35355

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[m2-assistant]

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