Update or replace hardcoded Route53 tests

[ianbotsf]

Describe the bug

We encountered a preview build failure recently from an updated Route53 model which changed the model version from 2013-04-01 to 2015-01-01. This caused the unit tests generated from the hardcoded test model to fail because they expect 2013-04-01 in the URI. We should either:

• Update these unit tests to be more flexible wrt model changes –or–
• Replace these generated unit tests with hand-written unit tests of the customized zone trimming behavior

Expected behavior

Unit tests shouldn't fail on valid model updates

Current behavior

Uni tests fail on valid model updates

Steps to Reproduce

See above

Possible Solution

No response

Context

No response

AWS SDK for Kotlin version

1.2.55

Platform (JVM/JS/Native)

JVM

Operating system and version

(n/a)