Adjust tests to start test server inside describe

[gregorwolf]

Hello cap-sflight Team,

The CAPire documentation on Testing with cds.test describes in the section Running a CAP Server that the cds.test should be started inside a describe:

const cds = require('@sap/cds')
describe(()=>{
  const test = cds.test(__dirname+'/..')
})

This is currently not done in https://github.com/SAP-samples/cap-sflight/blob/main/test/odata.test.js.

Best Regards
Gregor