[cloud] Fix freshness value to be an int milliseconds

[vijaykiran]

Freshness check sends the value as str(time delta) this should be milliseconds

{
      "identity": "check-test-workshop_ds-ORDERS-daily-created_at-Freshness-bfdcb2cd",
      "name": "freshness using created_at < 2h",
      "type": "metricThreshold",
      "definition": "checks for ORDERS [daily]:\n  freshness using created_at < 2h",
      "location": {
        "filePath": "checks/02_advanced_and_cool.yml",
        "line": 34,
        "col": 5
      },
      "dataSource": "workshop_ds",
      "table": "ORDERS",
      "column": "created_at",
      "metrics": [
        "metric-test-workshop_ds-ORDERS-daily-created_at-max"
      ],
      "outcome": "fail",
      "diagnostics": {
        "value": "27 days, 2:29:20.044015",
        "maxColumnTimestamp": "2022-02-24 16:25:52",
        "maxColumnTimestampUtc": "2022-02-24 16:25:52+00:00",
        "nowVariableName": "NOW",
        "nowTimestamp": "2022-03-23T18:55:12.044015",
        "nowTimestampUtc": "2022-03-23 18:55:12.044015+00:00",
        "freshness": "27 days, 2:29:20.044015"
      }
    }

[milanaleksic]

@vijaykiran please make it microseconds just as in python is currently, that part is not a problem. Perhaps we can later then support milis as well, but if you send millis instead of micros that would also fail current parser: https://github.com/sodadata/soda/blob/52f5bee6825f0e0e91672882d1a25ed61be2c9e9/soda-basics-gson/src/main/java/io/sodadata/basics/gson/DurationConverter.java#L34