Update `PropertySourceLoader` so that it no longer needs to deal with
matching multi-document files using the `spring.profile` property. The
loader now simply returns one or more `PropertSource` instances for a
given `Resource`.
All property matching now occurs in the `ConfigFileApplicationListener`.
This allows document processing logic to be contained in a single place,
and allows us to rationalize the algorithm so that negative matching
profiles are processed last.
Fixes gh-12159
Drop `SpringProfileDocumentMatcher` and replace it with two new
implementations that restrict when YAML documents are loaded. YAML
sections are now restricted both on the specific profile that is being
loaded, and the profiles that are currently accepted.
The `PropertySourceLoader` interface has been refined to include a
predicate that determines when a profile is accepted. The
`ConfigFileApplicationListener` simply delegates the predicate logic to
the `Environment`.
Fixes gh-8011
Stephane Nicoll
hdeadman
Phillip Webb
Andy Wilkinson