[Fix #1124] Fix false positives for Rails/RedundantActiveRecordAllMethod

[koic]

Fixes #1124.

This PR fixes false positives for Rails/RedundantActiveRecordAllMethod when receiver is not an Active Record model.

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• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
• Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.
• If this is a new cop, consider making a corresponding update to the Rails Style Guide.

[jorg-vr]

If I understand this correctly, this pr adds specific allowed receivers.

This would not solve the issue for this case: dodona-edu/dodona#4987
Where we use Docker::Container.all from https://github.com/upserve/docker-api

I think we need a more general solution

[koic]

I have written an explanation here: #1124 (comment)