(fix) MaxConcurrency does not support JsonPath

[abdelnn]

Issue # (if applicable)

Relates to #20835

Reason for this change

MaxConcurrency does not support JsonPath. This change adds MaxConcurrencyPath so that CDK users can specify a JsonPath for their MaxConcurrency

Note : This does not invalidate JsonPaths for MaxConcurrency, as I'm unsure how to do so without reverting #20279 . Open to suggestions

Description of changes

Added a new maxConcurrencyPath field that accepts a JsonPath value. Decided to go with another explicit field as it is similar to what is done for ErrorPath and CausePath, in addition to most other Path fields

Description of how you validated changes

Added unit tests

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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