Add directive for SSL Server block

[salonichf5]

Proposed changes

Problem: Users want to configure BackendTLS successfully with NGF.

Solution: Adds a directive proxy_ssl_server_name on in the server location block to avoid connection resets during SSL handshake.

Testing: Manual testing by installing NGF and verifying /etc/nginx/nginx.conf. Working with example

sa.choudhary@N9939CQ4P0 ~ % curl --resolve secure-app.example.com:$GW_PORT:$GW_IP http://secure-app.example.com:$GW_PORT/
Handling connection for 8080
hello from pod secure-app

nginx.conf

location / {


        proxy_set_header Host "$gw_api_compliant_host";
        proxy_set_header X-Forwarded-For "$proxy_add_x_forwarded_for";
        proxy_set_header Upgrade "$http_upgrade";
        proxy_set_header Connection "$connection_upgrade";
        proxy_pass https://default_secure-app_8443$request_uri;
        proxy_http_version 1.1;
        proxy_ssl_server_name on;
        proxy_ssl_verify on;
        proxy_ssl_name secure-app.example.com;
        proxy_ssl_trusted_certificate /etc/nginx/secrets/cert_bundle_default_backend-cert.crt;
    }

Please focus on (optional): If you any specific areas where you would like reviewers to focus their attention or provide
specific feedback, add them here.

Closes #1836

Checklist

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

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

Fixed issue when using BackendTLSPolicy that led to failed connections.

[sjberman]

Can you update the release note section in the PR description to say something like "Fixed issue when using BackendTLSPolicy that led to failed connections."

[sjberman]

Be sure to re-verify with the BackendTLSPolicy example to ensure it works.

[salonichf5]

Yes, just verified it with the new location and if it picks the right path proxy or grpc

Be sure to re-verify with the BackendTLSPolicy example to ensure it works.