Revert "Use values iterator and update in map equality/hash (#718)"

[jakemac53]

This reverts commit 1156cfe.

This broke some internal tests which have non conforming map implementations.

[devoncarew]

Thanks!

[github-actions]

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File	Coverage
pkgs/collection/lib/src/equality.dart	💚 89 % ⬆️ 0 %

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// for details. All rights reserved. Use of this source code is governed by a
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[jakemac53]

Not sure why it thinks this is breaking 🤔 , I just updated it to ignore the check