Update appropriate configuration properties to use the `Duration`
type, rather than an ad-hoc mix of milliseconds or seconds.
Configuration properties can now be defined in a consistent and readable
way. For example `server.session.timeout=5m`.
Properties that were previously declared using seconds are annotated
with `@DurationUnit` to ensure a smooth upgrade experience. For example
`server.session.timeout=20` continues to mean 20 seconds.
Fixes gh-11080
8f4bf233b4