tests: fix ssl generation

[thaJeztah]

the "integration-dind-ssl" tests were failing due to an issue with the test-certs created;

==================================== ERRORS ====================================
_________ ERROR at setup of BuildTest.test_build_container_with_target _________
/usr/local/lib/python3.12/site-packages/urllib3/connectionpool.py:464: in _make_request
    self._validate_conn(conn)
/usr/local/lib/python3.12/site-packages/urllib3/connectionpool.py:1093: in _validate_conn
    conn.connect()
/usr/local/lib/python3.12/site-packages/urllib3/connection.py:790: in connect
    sock_and_verified = _ssl_wrap_socket_and_match_hostname(
/usr/local/lib/python3.12/site-packages/urllib3/connection.py:969: in _ssl_wrap_socket_and_match_hostname
    ssl_sock = ssl_wrap_socket(
/usr/local/lib/python3.12/site-packages/urllib3/util/ssl_.py:480: in ssl_wrap_socket
    ssl_sock = _ssl_wrap_socket_impl(sock, context, tls_in_tls, server_hostname)
/usr/local/lib/python3.12/site-packages/urllib3/util/ssl_.py:524: in _ssl_wrap_socket_impl
    return ssl_context.wrap_socket(sock, server_hostname=server_hostname)
/usr/local/lib/python3.12/ssl.py:455: in wrap_socket
    return self.sslsocket_class._create(
/usr/local/lib/python3.12/ssl.py:1041: in _create
    self.do_handshake()
/usr/local/lib/python3.12/ssl.py:1319: in do_handshake
    self._sslobj.do_handshake()
E   ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: invalid CA certificate (_ssl.c:1010)

During handling of the above exception, another exception occurred:
/usr/local/lib/python3.12/site-packages/urllib3/connectionpool.py:787: in urlopen
    response = self._make_request(
/usr/local/lib/python3.12/site-packages/urllib3/connectionpool.py:488: in _make_request
    raise new_e
E   urllib3.exceptions.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: invalid CA certificate (_ssl.c:1010)

[Copilot]

Pull Request Overview

This PR fixes SSL certificate generation issues in the integration test suite. The changes address certificate verification failures by properly configuring CA, server, and client certificates with correct X.509 v3 extensions and key usage attributes.

• Adds proper v3_ca extension configuration for the Certificate Authority
• Implements correct key usage and extended key usage for server certificates
• Configures proper client authentication extensions for client certificates

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