Sliced tests doesn't reuse cached contexts when testing with Spock's spock.lang.* annotations.

[erling]

Spock's spock.lang.* annotations to a specification makes each spec appear to be different:

@spock.lang.Ignore
static class FirstSpockAnnotatedTestClass {}

@spock.lang.Stepwise
static class SecondSpockAnnotatedTestClass {}

Only partially solved by issue 7524.

Added PR: https://github.com/spring-projects/spring-boot/pull/8252/files

[snicoll]

Closing in favour of PR #8252 (@erling no need for a separate issue if you intend to submit a PR right the way).