Fix 9 rubocop violations for Graphql/ResourceNotAvailableError

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Fixes the 9 violations for the rubocop rule Graphql/ResourceNotAvailableError that were previously excluded in .rubocop_todo/graphql/resource_not_available_error.yml. The exclusions have now been removed.

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Edited by Project token used in gitlab-org/quality/engineering-productivity/team/-/settings/ci_cd as `HOUSEKEEPER_GITLAB_API_TOKEN`

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