chore: rename agent firewall flags (#27231)

* Alias --boundary-log-proxy-socket-path to
--agent-firewall-log-proxy-socket-path
* Also alias CODER_AGENT_BOUNDARY_LOG_PROXY_SOCKET_PATH to
CODER_AGENT_FIREWALL_LOG_PROXY_SOCKET_PATH
* Also Rename related variables and symbols to reflect the new name.

<!--

If you have used AI to produce some or all of this PR, please ensure you
have read our [AI Contribution
guidelines](https://coder.com/docs/about/contributing/AI_CONTRIBUTING)
before submitting.

-->

cli/testdata/coder_agent_--help.golden

@@ -31,6 +31,10 @@ OPTIONS:
       --log-stackdriver string, $CODER_AGENT_LOGGING_STACKDRIVER
           Output Stackdriver compatible logs to a given file.
 
+      --agent-firewall-log-proxy-socket-path string, $CODER_AGENT_FIREWALL_LOG_PROXY_SOCKET_PATH (default: /tmp/boundary-audit.sock)
+          The path for the agent firewall log proxy server Unix socket. Agent
+          firewall should write audit logs to this socket.
+
       --agent-header string-array, $CODER_AGENT_HEADER
           Additional HTTP headers added to all requests. Provide as key=value.
           Can be specified multiple times.
@@ -49,10 +53,6 @@ OPTIONS:
       --block-reverse-port-forwarding bool, $CODER_AGENT_BLOCK_REVERSE_PORT_FORWARDING (default: false)
           Block reverse port forwarding through the SSH server (ssh -R).
 
-      --boundary-log-proxy-socket-path string, $CODER_AGENT_BOUNDARY_LOG_PROXY_SOCKET_PATH (default: /tmp/boundary-audit.sock)
-          The path for the boundary log proxy server Unix socket. Boundary
-          should write audit logs to this socket.
-
       --debug-address string, $CODER_AGENT_DEBUG_ADDRESS (default: 127.0.0.1:2113)
           The bind address to serve a debug HTTP server.