Add test for cases: replace by value and replace by constructor

[zenthangplus]

Issue:

• Replace by value: work
• Replace by constructor: not work

[sywhang]

This is expected behavior. fx.Replace only works on values.

Refer to the documentation: https://pkg.go.dev/go.uber.org/fx#Replace

Replace provides instantiated values for graph modification as if they had been provided using a decorator with fx.Decorate. The most specific type of each value (as determined by reflection) is used.

[sywhang]

Please also use our https://github.com/uber-go/fx/discussions section to see if it's a bug rather than opening PRs.