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

coderd/workspaceagents_test.go

@@ -1173,10 +1173,12 @@ func TestWorkspaceAgentContainers(t *testing.T) {
 					Labels:       testLabels,
 					Running:      true,
 					Status:       "running",
-					Ports: []codersdk.WorkspaceAgentListeningPort{
+					Ports: []codersdk.WorkspaceAgentDevcontainerPort{
 						{
-							Network: "tcp",
-							Port:    80,
+							Network:  "tcp",
+							Port:     80,
+							HostIP:   "0.0.0.0",
+							HostPort: 8000,
 						},
 					},
 					Volumes: map[string]string{