doc: add REE removal to 8.0 breaking changes #12914
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Release notes
[rn:skip]
What does this PR do?
Adds an entry to the breaking changes doc for the 8.0 removal of the Ruby Execution Engine, which was merged in #12490
Why is it important/What is the impact to the user?
Helps users considering upgrading to Logstash 8.0 understand the scope of changes.
Checklist
[ ] My code follows the style guidelines of this project[ ] I have commented my code, particularly in hard-to-understand areas[ ] I have made corresponding change to the default configuration files (and/or docker env variables)[ ] I have added tests that prove my fix is effective or that my feature worksHow to test this PR locally
Related issues
Related: #11236