fix(certificate_builder): Add ssl factory entrypoint for cqlshrc

This commit allows scylla-doctor to use correct certificates when
checking CQLsh liveliness.

Fixes #10490

Author: k0machi

Diff for: sdcm/provision/scylla_yaml/certificate_builder.py

@@ -31,6 +31,10 @@
 def update_cqlshrc(cqlshrc_file: str = CQLSHRC_FILE, client_encrypt: bool = False) -> None:
     config = configparser.ConfigParser()
     config.read(cqlshrc_file)
+    if client_encrypt:
+        if not config['connection']:
+            config['connection'] = {}
+        config['connection']['ssl'] = 'true'
     config['ssl'] = {
         'validate': 'true' if client_encrypt else 'false',
         'certfile': f'{SCYLLA_SSL_CONF_DIR / CA_CERT_FILE.name}',