DRAFT - Correctly unescape client certificates in format passed by AWS ALB

[nebulans]

Description

Demo solution to #31728 - use url.PathUnescape to correctly unescape client certificates in the format used by AWS ALBs.

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[hashicorp-cla-app]

Thank you for your submission! We require that all contributors sign our Contributor License Agreement ("CLA") before we can accept the contribution. Read and sign the agreement

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