New integration tests for cross cluster search

[nibix]

Description

This introduces tests for CCS which can be targeted against different cluster configuration sets.

This is in preparation for the "Improved index resolution" project #5399 and allows us to test the different privilege evaluation implementations and compare their behavior.

• Category: Maintenance
• Why these changes are required? Preparation for Introduced explicit index resolution API #5399
• What is the old behavior before changes and new behavior after changes? no changes

Check List

• New functionality includes testing
• New functionality has been documented
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.27%. Comparing base (b07702d) to head (e44ed30).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5762      +/-   ##
==========================================
- Coverage   73.30%   73.27%   -0.04%     
==========================================
  Files         435      435              
  Lines       26485    26491       +6     
  Branches     3945     3945              
==========================================
- Hits        19416    19410       -6     
- Misses       5188     5199      +11     
- Partials     1881     1882       +1     

see 8 files with indirect coverage changes

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