Refine `buildSrc` so that `spring.mavenRepositories()` are considered
for all build types (not just milestones and snapshots). We now pass
"springFrameworkVersion" to `SpringRepositorySupport.groovy` so that
repo.spring.io doesn't get added for OSS builds using release artifacts.
Closes gh-46823
Create a small Groovy script that can be used in `settings.gradle`
files to extend `repositories` to support the various maven
repositories required for our build.
See gh-42333
Phillip Webb