fix(cli): port-forward: update workspace last_used_at (#12659)

This PR updates the coder port-forward command to periodically inform coderd that the workspace is being used:

- Adds workspaceusage.Tracker which periodically batch-updates workspace LastUsedAt
- Adds coderd endpoint to signal workspace usage
- Updates coder port-forward to periodically hit this endpoint
- Modifies BatchUpdateWorkspacesLastUsedAt to avoid overwriting with stale data

Co-authored-by: Danny Kopping <danny@coder.com>

coderd/apidoc/docs.go

@@ -7592,6 +7592,35 @@ const docTemplate = `{
                 }
             }
         },
+        "/workspaces/{workspace}/usage": {
+            "post": {
+                "security": [
+                    {
+                        "CoderSessionToken": []
+                    }
+                ],
+                "tags": [
+                    "Workspaces"
+                ],
+                "summary": "Post Workspace Usage by ID",
+                "operationId": "post-workspace-usage-by-id",
+                "parameters": [
+                    {
+                        "type": "string",
+                        "format": "uuid",
+                        "description": "Workspace ID",
+                        "name": "workspace",
+                        "in": "path",
+                        "required": true
+                    }
+                ],
+                "responses": {
+                    "204": {
+                        "description": "No Content"
+                    }
+                }
+            }
+        },
         "/workspaces/{workspace}/watch": {
             "get": {
                 "security": [