Fix port in use error in coverage test suite

[kethinov]

When running the npm run coverage command, this happens:

[WebServer] node:events:496
[WebServer]       throw er; // Unhandled 'error' event
[WebServer]       ^
[WebServer]
[WebServer] Error: listen EADDRINUSE: address already in use 0.0.0.0:6588
[WebServer]     at Server.setupListenHandle [as _listen2] (node:net:1940:16)
[WebServer]     at listenInCluster (node:net:1997:12)
[WebServer]     at node:net:2206:7
[WebServer]     at process.processTicksAndRejections (node:internal/process/task_queues:90:21)
[WebServer] Emitted 'error' event on Server instance at:
[WebServer]     at emitErrorNT (node:net:1976:8)
[WebServer]     at process.processTicksAndRejections (node:internal/process/task_queues:90:21) {
[WebServer]   code: 'EADDRINUSE',
[WebServer]   errno: -48,
[WebServer]   syscall: 'listen',
[WebServer]   address: '0.0.0.0',
[WebServer]   port: 6588
[WebServer] }

Also the coverage analysis doesn't analyze actual test coverage, just the dev scripts.