message: add ecschema-metadata tests to test-no-gui script
diff: "docs": " ",
  "buildDocSite": "cd tools/bemetalsmith && npm run buildDocSite",
  "test": "npm run test-no-gui && npm run test:frontend",
  - "test-no-gui": "npm run test:bentley && npm run test:geometry && npm run test:clients && npm run test:backend && npm run test:example-code-snippets && npm run test:example-code-app",
  + "test-no-gui": "npm run test:bentley && npm run test:geometry && npm run test:clients && npm run test:backend && npm run test:example-code-snippets && npm run test:example-code-app && npm run test:ecschema-metadata",
  "test:integration": "npm run test:clients:integration && npm run test:backend:integration && npm run test:frontend:integration && npm run test:example-code-snippets && npm run test:example-code-app",
  "test:bentley": "cd core/bentley && npm run test",
  "test:geometry": "cd core/geometry && npm run test",
  