Only check validity of certs in the chain of the node certificates

[cwperks]

Description

This PR updates the certificate validation checks on bootup to limit validation to only the certificates within the chain of the node certificates. In 2.18.0 there was a change that validated all certificates contained in a bundle even if they were not part of the chain from the node certificates. Since those certs are not pertinent to OpenSearch, the validation does not need to occur.

Opening this in Draft as POC to start soliciting some feedback. Automated tests need to be added for different scenarios.

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

Bug fix

Issues Resolved

Related issue: #4949

See discussion on forum: https://forum.opensearch.org/t/is-this-an-issue-with-opensearch-or-the-security-plugin-upgrading-from-2-17-1-to-2-18-0/22395

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.