Allow groups to be used with standard locations so that order of
profile-specific files is consistent.
Prior to this commit, the default search locations considered for
application properties/yaml files was the following:
optional:classpath:/
optional:classpath:/config/
optional:file:./
optional:file:./config/
optional:file:./config/*/
Each of these locations was independent which could cause confusion
if certain combinations were used. For example, if profile-specific
files were added to `classpath:/` and `classpath:/config/` then the
latter would always override the former regardless of the profile
ordering.
This commit updates `StandardConfigDataLocationResolver` so that a
group of locations can be specified for each item. This allows us to
define the following set of search locations which provide more logical
ordering for profile-specific files
optional:classpath:/;optional:classpath:/config/
optional:file:./;optional:file:./config/;optional:file:./config/*/
Closes gh-26593
7396e1e743