AccessManager tests consolidation

[ernestognw]

After #4642, #4632 and #4642, some improvements were left out. This PR adds missing review comments, tests cases, consolidated utilities, and also improves documentation for AccessManager tests.

PR Checklist

• Tests
• Documentation
• Changeset entry (run npx changeset add)

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Latest commit: ba61108

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[Amxx]

The test/helpers/namespaced-storage.js can probably be improved using ethers instead of web3, but we'll do that during the migration.

LGTM

[ernestognw]

Definitely, let's wait until migrating AccessManager tests to ethers.
Merging