yaml callback: use new util introduced in ansible-core 2.19.0b2 (#10242)
* Avoid repeating some code.
* Use new utility added for ansible-core 2.19.0b2.
* Lint.
* Add changelog fragment.
* transform_to_native_types() does not convert map keys.
To catch all tagged strings, we have to recursively walk the data structure then.
* Add test with vaulted string.
(cherry picked from commit 66cb9aefb5)
