workaround for #4555: copy the requestBuilder before mutation to avoid side effects

[owengo]

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Summary

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Change Type

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• [ x] Bug fix (non-breaking change which fixes an issue)

Testing

I used the same repro procedure described in #4555 with the math assistant api.
When a custom auth is configured the assistant can successfully call the same action in parallel many times and have correct results for each of them.
Without this workaround all the results are the same.

Test Configuration:

Checklist

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• My code adheres to this project's style guidelines
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• [x ] My changes do not introduce new warnings

The commit is a workaround, a better solution would probably mean to separate the requestBuilder / ActionRequest from the parameters and headers used at execution time, or to no more share the requestBuilders between all the calls.
As it is it has a minimal impact on the code and fixes the issue with assistants.

[danny-avila]

Thanks for reporting this, addressing here: #4566

a better solution would probably mean to separate the requestBuilder / ActionRequest from the parameters and headers used at execution time, or to no more share the requestBuilders between all the calls.

I agree, so I took the time to test for the expected immutability/isolation between requests. Let me know if my fix addresses the issue.