Fix task parameters in CI build pipeline
Fix task parameters in CI build pipeline

Prior to this commit, the task parameters for the CI project checks were
overridden by a task anchor. This commit splits the anchor declaration
and ensures that the `TEST_TOOLCHAIN` setting is set for the JDK
variant builds.

See gh-25787

spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework