chore: cert directives for ssl_client_certificate and ssl_trusted_certificate

[CodeMonkeyF5]

Proposed changes

Add support for the ssl_client_certificate and ssl_trusted_certificate directives to treat them the same as ssl_certificate and ssl_proxy_certificate. Certificates managed in NMS can then appropriately display the associations for NGINX Instance and Instance Groups when configured.

This change is required to complete the expected end-to-end behaviors.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

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