Assertions execution should follow the same order as Pre/Post Processor

[Philippe Mouawad]

Hello,
When you have elements at different scopes:
- Pre and Post Processors are processed from OUTER to INNER scope
- while assertions are processed from INNER to OUTER scope

I don't see any regression risk

I propose we align it.
See:
https://bz.apache.org/bugzilla/show_bug.cgi?id=61815

-- 
Cordialement.
Philippe