fix(agent/agentcontainers): improve testing of convertDockerInspect, return correct host port (#16887)

* Improves separation of concerns between `runDockerInspect` and
`convertDockerInspect`: `runDockerInspect` now just runs the command and
returns the output, while `convertDockerInspect` now does all of the
conversion and parsing logic.
* Improves testing of `convertDockerInspect` using real test fixtures.
* Fixes issue where the container port is returned instead of the host
port.
* Updates UI to link to correct host port. Container port is still
displayed in the button text, but the HostIP:HostPort is shown in a
popover.
* Adds stories for workspace agent UI

docs/reference/api/agents.md

@@ -676,9 +676,10 @@ curl -X GET http://coder-server:8080/api/v2/workspaceagents/{workspaceagent}/con
       "name": "string",
       "ports": [
         {
+          "host_ip": "string",
+          "host_port": 0,
           "network": "string",
-          "port": 0,
-          "process_name": "string"
+          "port": 0
         }
       ],
       "running": true,