Re-enable FunctionTransformSpec tests when core bug is addresseed

[wetted]

The following tests are disabled with @PendingFeature pending a fix for micronaut-projects/micronaut-core#10580.

io.micronaut.function.groovy.FunctionTransformSpec

• run JSON bi-consumer as REST service
• run function as REST service
• run JSON function as REST service
• run supplier as REST service