[FEATURE REQUEST] Make custom admin certificate configurable without need to edit sources when upgrading OpenSearch

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Is your feature request related to a problem? Please describe. We added new functionality for upgrade mode in PR #2384 so now we should replace workaround described in our docs. The current workaround requires editing the source code inside container.

Describe the solution you'd like Use --file parameter to define custom admin certificate settings via configuration file.

Describe alternatives you've considered n/a

Additional context For testing the new functionality, we may need a new pipeline.

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DoD checklist

• Changelog
  • [ ] updated
  • [ ] not needed
• COMPONENTS.md
  • [ ] updated
  • [ ] not needed
• Schema
  • [ ] updated
  • [ ] not needed
• Backport tasks
  • [ ] created
  • [ ] not needed
• Documentation
  • [ ] added
  • [ ] updated
  • [ ] not needed
• [ ] Feature has automated tests
• [ ] Automated tests passed (QA pipelines)
  • [ ] apply
  • [ ] upgrade
  • [ ] backup/restore
• [ ] Idempotency tested
• [ ] All conversations in PR resolved
• [ ] Solution meets requirements and is done according to design doc
• [ ] Usage compliant with license