fix(vitest): don't start a websocket server if api is disabled (#6617)

Author: sheremet-va

packages/vitest/src/node/plugins/index.ts

@@ -98,6 +98,7 @@ export async function VitestPlugin(
             ...testConfig.api,
             open,
             hmr: false,
+            ws: testConfig.api?.middlewareMode ? false : undefined,
             preTransformRequests: false,
             fs: {
               allow: resolveFsAllow(getRoot(), testConfig.config),

packages/vitest/src/node/plugins/workspace.ts

@@ -85,6 +85,7 @@ export function WorkspaceVitestPlugin(
             watch: null,
             open: false,
             hmr: false,
+            ws: false,
             preTransformRequests: false,
             middlewareMode: true,
             fs: {