message: fix(preview-service prometheus): additional buckets in prometheus histogram
  All previews were in the 600 to infinity bucket of the histogram, rendering it effectively useless.
  This PR adds additional larger buckets at 1200 and 1800 ranges to provide better granularity.
diff: @@ -100,7 +100,7 @@ module.exports = {
  metricDuration: new prometheusClient.Histogram({
  name: 'speckle_server_operation_duration',
  help: 'Summary of the operation durations in seconds',
  - buckets: [0.5, 1, 5, 10, 30, 60, 300, 600],
  + buckets: [0.5, 1, 5, 10, 30, 60, 300, 600, 1200, 1800],
  labelNames: ['op']
  }),
  