The version of Spring Boot should not be modifiable by a property,
only being using a different version of spring-boot-dependencies or
spring-boot-starter-parent.
Fixes gh-23174
Previously, Spring Boot's modules published Gradle Module Metadata
(GMM) the declared a platform dependency on spring-boot-dependencies.
This provided versions for each module's own dependencies but also had
they unwanted side-effect of pulling in spring-boot-dependencies
constraints which would influence the version of other dependencies
declared in the same configuration. This was undesirable as users
should be able to opt in to this level of dependency management, either
by using the dependency management plugin or by using Gradle's built-in
support via a platform dependency on spring-boot-dependencies.
This commit reworks how Spring Boot's build uses
spring-boot-dependencies and spring-boot-parent to provide its own
dependency management. Configurations that aren't seen by consumers are
configured to extend a dependencyManagement configuration that has an
enforced platform dependency on spring-boot-parent. This enforces
spring-boot-parent's version constraints on Spring Boot's build without
making them visible to consumers. To ensure that the versions that
Spring Boot has been built against are visible to consumers, the
Maven publication that produces pom files and GMM for the published
modules is configured to use the resolved versions from the module's
runtime classpath.
Fixes gh-21911
Previously, the retry plugin was only applied on CI as we do not want
tests to be retried in local builds. Unfortunately, this arrangement
led to test tasks from CI builds having additional doFirst and doLast
actions and an additional property. These differences meant that the
output from a test task that has run on CI could not be used by a
local build.
This commit changes our configuration of the test retry plugin so
that it is now always applied. To retain the behaviour of only
retrying tests on CI, max retries is configured to 3 on CI and 0 for
local builds.
Closes gh-21698
