PullLight found 1 issue

When a concurrent duplicate-name error is caught and the sandbox is fetched via `getNamedVercelSandbox`, `requiresBaseRuntimeSetup` is set to `input.snapshotId === undefined`. This means the concurrently-created sandbox (which was already set up by the first caller) will have `ensureVercelSandboxBaseRuntime` and `applyInitialVercelNetworkPolicy` applied to it a second time by the second caller. The adopted sandbox should be treated as already set up (i.e., `requiresBaseRuntimeSetup: false`), otherwise the base runtime setup runs twice on the same sandbox.