fix(aria/allowed-attr): work with standards object

[straker]

Refactored allowedAttr to have a better happy path and return early if no role def was found, also didn't need to concat everything. Since getting global attrs is found in a lot of code, went ahead and cached the result as it shouldn't change during a run.

The integration tests were expected from the diff in our lookup table in #2328 (comment)

Part of #2108

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