Clock skew interceptor is only applied when constructing clients via `fromEnvironment`

[aajtodd]

Describe the bug

The ClockSkewInterceptor is only applied via finalizeConfig which is only invoked when constructing clients via fromEnvironment

Expected behavior

ClockSkew should always be applied when constructing a client.

Current behavior

Clock skew may or may not be applied

Steps to Reproduce

N/A

Possible Solution

No response

Context

No response

AWS Kotlin SDK version used

1.0.51

Platform (JVM/JS/Native)

N/A

Operating System and version

N/A