RSpec/UselessDynamicDefinition: Fix current offenses

Ashutosh Guptarequested to merge
gitlab-community/gitlab-org/gitlab:issue_406761-create_table_with_foreign_keys_spec into master

This issue aims to solve #406761 (closed)

Resolve the offences by introducing a context in:

  • spec/rubocop/cop/migration/create_table_with_foreign_keys_spec.rb

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