feat: new backend operator '_match_any_in_subtree' to do ontology filter expansion to children server side

[mswertz]

What are the main changes you did

• we now get very big queries when you select root nodes in large ontologies, because all children are included as seperate filters. Makes all slow. Instead this PR aims to do the heavy lifting server side. Also will allow data to be smaller, and excel/csv uploads easier, when users can simply include the terms they mean without the sub terms.

N.B. blocks on some of the changes from #4539

How to test

• see junit tests
• see changes to the javascript => see that URLs are smaller

Checklist

• updated docs in case of new feature
• added/updated tests
• added/updated testplan to include a test for this fix, including ref to bug using # notation

[sonarqubecloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
88.6% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud