Add validation for null array DataType

[afazel]

opendistro-for-elasticsearch/security pull request intake form

Please provide as much details as possible to get feedback/acceptance on your PR quickly

1. Category: (Enhancement, New feature, Bug fix, Test fix, Refactoring, Maintenance, Documentation)
   Bug fix

2. Github Issue # or road-map entry, if available:
   disallow using null in users list #1136

3. Description of changes:
   Add validation for all the API keys that have ARRAY DataType to make sure that there is no null value in the array.

4. Why these changes are required?
   By adding this validation, we prevent ES being completely unoperational when there are null in the arrays.

5. What is the old behavior before changes and new behavior after changes? (Please add any example/logs/screen-shot if available)
   It was possible to bring ES completely unoperational by using null in the array DataTypes in several APIs.

6. Testing done: (Please provide details of testing done: Unit testing, integration testing and manual testing)
   Unit test added to cover array DataType like users with null in their list.

7. TO-DOs, if any: (Please describe pending items and provide Github issues# for each of them)

8. Is it backport from main branch? (If yes, please add backport PR # and commits #)

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[afazel]

The failure in the unit tests was related to the bug in my code, I fixed the bug in my last commit and now all the tests passed.

[codecov-commenter]

Codecov Report

Merging #1157 (eb25905) into main (dc34c54) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               main    #1157   +/-   ##
=========================================
  Coverage     64.74%   64.74%           
- Complexity     3195     3203    +8     
=========================================
  Files           247      247           
  Lines         17232    17252   +20     
  Branches       3046     3053    +7     
=========================================
+ Hits          11156    11170   +14     
- Misses         4526     4531    +5     
- Partials       1550     1551    +1     

Impacted Files	Coverage Δ
...est/validation/AbstractConfigurationValidator.java	83.89% <100.00%> (+2.49%)	⬆️
...org/opensearch/security/rest/TenantInfoAction.java	77.94% <0.00%> (-10.30%)	⬇️
...a/org/opensearch/security/tools/SecurityAdmin.java	47.26% <0.00%> (-0.27%)	⬇️
...security/configuration/DlsFlsFilterLeafReader.java	60.47% <0.00%> (+0.70%)	⬆️

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