Moved dco.yml to workflows folder

[davidlago]

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

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

Enhancement

Github Issue # or road-map entry, if available:

Closes #1463

Description of changes:

Added DCO check to repository

Why these changes are required?

See opensearch-project/project-meta#17

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

No DCO checks on PR

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

N/A

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

N/A

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

No

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[codecov-commenter]

Codecov Report

Merging #1469 (7b5ba45) into main (b033d64) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #1469      +/-   ##
============================================
- Coverage     64.90%   64.88%   -0.02%     
+ Complexity     3232     3229       -3     
============================================
  Files           247      247              
  Lines         17335    17335              
  Branches       3072     3072              
============================================
- Hits          11251    11248       -3     
- Misses         4528     4531       +3     
  Partials       1556     1556              

Impacted Files	Coverage Δ
...ecurity/configuration/ConfigurationRepository.java	73.07% <0.00%> (-2.20%)	⬇️
...iance/ComplianceIndexingOperationListenerImpl.java	60.86% <0.00%> (-1.45%)	⬇️
...a/org/opensearch/security/tools/SecurityAdmin.java	47.26% <0.00%> (-0.27%)	⬇️
...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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