GraphQL: Add support for sorting when querying Projects

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We should support the same sorting criteria as the REST API: https://docs.gitlab.com/ee/api/projects.html#list-all-projects

Return projects ordered by id, name, path, created_at, updated_at, or last_activity_at fields. repository_size, storage_size, or wiki_size fields are only allowed for admins. Default is created_at

Related issue: #224737

See: https://docs.gitlab.com/api/graphql/reference/#queryprojects