Add Boolean#parseBoolean to forbidden-apis

[jaymode]

In #22200, existing boolean parsing was made strict so that:

"true" is converted to the boolean value true, "false" is converted to the boolean value false. Everything else raises an error.

However, usages of Boolean.parseBoolean have made their way into the codebase since then and the implementation of the JDKs boolean parsing logic is anything but strict as a string that is a case-insensitive match to true will be true and everything else will be false.

I think we should remove these usages of Boolean.parseBoolean after deprecation in the places where it was previously used and add this API to our forbidden-apis list.

[elasticmachine]

Pinging @elastic/es-core-infra (:Core/Infra/Core)

[rjernst]

It is unfortunate we let this lapse; a lot of work went into removing uses of lenient boolean parsing. It looks like most of the uses added are in tests, although there appear to be a couple that are user facing. +1 to adding the method to forbidden apis to stop the bleeding.