Update OpenSearch core dependency version to 1.2.0

[cliu123]

opensearch-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)
   Maintenance

2. Github Issue # or road-map entry, if available:
   Release version 1.2 #1459

3. Description of changes:

• Update the OpenSearch core dependency version to 1.2.0
• No longer building OpenSearch core artifact in CD workflow

4. Why these changes are required?
   OpenSearch 1.2.0 release readiness

5. What is the old behavior before changes and new behavior after changes? (Please add any example/logs/screen-shot if available)

6. Testing done: (Please provide details of testing done: Unit testing, integration testing and manual testing)

• Compiled security plugin on OpenSearch core 1.2.0
• CD run: https://github.com/cliu123/security/runs/4074851626?check_suite_focus=true
• Installed security plugin 1.2.0 on OpenSearch 1.2.0

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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[cliu123]

Will rebase the branch and re-run CI after PR#1479 gets merged.

[codecov-commenter]

Codecov Report

Merging #1482 (25a023e) into main (235c475) will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #1482      +/-   ##
============================================
+ Coverage     64.88%   64.90%   +0.02%     
- Complexity     3229     3231       +2     
============================================
  Files           247      247              
  Lines         17335    17335              
  Branches       3072     3072              
============================================
+ Hits          11247    11252       +5     
+ Misses         4532     4527       -5     
  Partials       1556     1556              

Impacted Files	Coverage Δ
...security/configuration/DlsFlsFilterLeafReader.java	59.76% <0.00%> (-0.71%)	⬇️
...ecurity/configuration/ConfigurationRepository.java	75.27% <0.00%> (+2.19%)	⬆️
...nsearch/security/dlic/rest/api/AuditApiAction.java	68.08% <0.00%> (+4.25%)	⬆️
...ecurity/configuration/StaticResourceException.java	25.00% <0.00%> (+25.00%)	⬆️

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