Allow @IgnoreIf to be used as meta-annotation

Is your feature request related to a problem?

We have many long-running integration tests annotated with custom @IntegrationSpec, that are not to be run as part of the standard build.
Hence, we want to exclude the long-running tests if a slow-test system property is defined.

The annotation looks like this:

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@DataJpaTest
@AutoConfigureEmbeddedDatabase
@IgnoreIf(value = { System.getProperty("slow-test") != "true" })
@interface IntegrationSpec {}

When using the @IgnoreIf as a meta-annotation the way above, it is ignored by Spock.

Describe the solution you'd like

The @ignoreIf annotation allows inheritance. However, it would be cleaner if the @ignoreIf could be used as a meta-annotation so that the tests can extend Specification rather than a custom implementation, that would exist only because of the need for @IgnoreIf being applied to it.

Describe alternatives you've considered

At the moment, we use Groovy @AnnotationCollector to work around the problem. However, IntelliJ has got issues whenever recompiling the code.

Additional context

No response

No files or tests are named in the issue. Start by reproducing the shown @IntegrationSpec example and tracing how Spock handles @IgnoreIf and meta-annotations; done means @IgnoreIf works through the custom annotation while specifications can still extend Specification.