Update `PropertiesMigrationReporter` so that already migrated properties
are not reported. Prior to this commit, if a deprecated property was
replaced by a property that could bind with the name relaxed name it
would be reported. For example: `test.someproperty` being replaced with
`test.some-property`.
In order to check the actual underlying property name, the
`PropertySourceOrigin` class has been updated so that it is always
returned, even if another `Origin` is available.
Fixes gh-35774
Phillip Webb
Tobias Lippert
Johnny Lim
Phillip Webb
Moritz Halbritter
Andy Wilkinson