New integration tests for Dashboards multi-tenancy

[nibix]

Description

This introduces integration tests for Dashboards multi-tenancy based on the concept that is also used by the other newly authorization integration tests.

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 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 73.19%. Comparing base (da520a0) to head (634e80f).
⚠️ Report is 22 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5753      +/-   ##
==========================================
+ Coverage   73.12%   73.19%   +0.06%     
==========================================
  Files         435      435              
  Lines       26665    26665              
  Branches     3999     3999              
==========================================
+ Hits        19499    19517      +18     
+ Misses       5249     5240       -9     
+ Partials     1917     1908       -9     

see 12 files with indirect coverage changes

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[DarshitChanpura]

thanks @nibix . Changes lgtm. Left a couple of clarifying comments.

[cwperks]

@nibix thank you for adding more tests case within this repo for this. I think this repo is lacking is this area.

[nibix]

@DarshitChanpura could you have another look at this, please?