test: convert top level tests to typescript (#4526)

package.json

test/chai.js

test/config/cli.spec.ts

test/config/env.spec.ts

test/globals.ts

test/manager/npm/update.spec.ts

test/newline-snapshot-serializer.js

test/newline-snapshot-serializer.ts

test/proxy.spec.ts

test/renovate.spec.ts

test/static-files.spec.ts

test/website-docs.spec.ts

yarn.lock