[2.x] Optimize privilege evaluation for index permissions across '*' index pattern (i.e. all_access role)

[cwperks]

Description

Creating this backport to explore a small optimization for the all_access role when evaluating index permissions in clusters with a large number of indices.

This PR is not a strategic fix like #4898. #4898 takes a holistic approach to optimize privilege evaluation for any type of role definition.

• Category (Enhancement, New feature, Bug fix, Test fix, Refactoring, Maintenance, Documentation)

Performance improvement

Check List

• New functionality includes testing
• New functionality has been documented
• New Roles/Permissions have a corresponding security dashboards plugin PR
• API changes companion pull request created
• 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.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.93%. Comparing base (55ff20e) to head (53ada80).
Report is 15 commits behind head on 2.x.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.x    #4926      +/-   ##
==========================================
+ Coverage   63.91%   63.93%   +0.01%     
==========================================
  Files         330      330              
  Lines       23118    23148      +30     
  Branches     3745     3752       +7     
==========================================
+ Hits        14777    14800      +23     
- Misses       6509     6514       +5     
- Partials     1832     1834       +2     

Files with missing lines	Coverage Δ
...pensearch/security/securityconf/ConfigModelV7.java	67.54% <100.00%> (+0.24%)	⬆️

... and 12 files with indirect coverage changes

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[shikharj05]

Thanks for the contribution, can we add some tests?

[cwperks]

Thanks for the contribution, can we add some tests?

Added unit tests.