Update examples to use lifecycle files

[kquerna]

Description

The vast majority of times that lifecycles are hooked, it is for app-level one-offs. Let's do a pass on our doc examples to demonstrate this format, rather than in plugin hooks.

There may be some lifecycle examples where plugin are the suitable example to show, so use discretion in these changes.

Package(s): @gasket/*

AC:

• Lifecycle examples demonstrate {{lifecycles/}} files over plugin hooks.