[BUG] upgrade filter bug

[kaituo]

What is the bug?
When upgrading an old detector, we have difficulty updating filter.

How can one reproduce the bug?
Steps to reproduce the behavior:
1)create a 7.10.2 cluster
2)create a detector with 2+ filters like

{
  "_id" : "oNwA9YUBsE8lmktYbzIg",
  "_version" : 5,
  "_primary_term" : 1,
  "_seq_no" : 4,
  "anomaly_detector" : {
    "name" : "single",
    "description" : "",
    "time_field" : "@timestamp",
    "indices" : [
      "server-metrics"
    ],
    "filter_query" : {
      "bool" : {
        "filter" : [
          {
            "term" : {
              "service" : {
                "value" : "app_3",
                "boost" : 1.0
              }
            }
          },
          {
            "term" : {
              "host" : {
                "value" : "server_2",
                "boost" : 1.0
              }
            }
          }
        ],
        "adjust_pure_negative" : true,
        "boost" : 1.0
      }
    },
    "detection_interval" : {
      "period" : {
        "interval" : 1,
        "unit" : "Minutes"
      }
    },
    "window_delay" : {
      "period" : {
        "interval" : 1,
        "unit" : "Minutes"
      }
    },
    "shingle_size" : 8,
    "schema_version" : 0,
    "feature_attributes" : [
      {
        "feature_id" : "Zt8E9YUBWn0Gyxrz0mwI",
        "feature_name" : "denyMax",
        "feature_enabled" : true,
        "aggregation_query" : {
          "deny_max" : {
            "max" : {
              "field" : "deny"
            }
          }
        }
      }
    ],
    "ui_metadata" : {
      "features" : {
        "denyMax" : {
          "aggregationBy" : "max",
          "aggregationOf" : "deny",
          "featureType" : "simple_aggs"
        }
      },
      "filters" : [
        {
          "fieldInfo" : [
            {
              "label" : "service",
              "type" : "keyword"
            }
          ],
          "fieldValue" : "app_3",
          "operator" : "is"
        },
        {
          "fieldInfo" : [
            {
              "label" : "host",
              "type" : "keyword"
            }
          ],
          "fieldValue" : "server_2",
          "operator" : "is"
        }
      ],
      "filterType" : "simple_filter"
    },
    "last_update_time" : 1674853271580,
    "user" : {
      "name" : "admin123",
      "backend_roles" : [ ],
      "roles" : [
        "security_manager",
        "all_access"
      ],
      "custom_attribute_names" : [ ],
      "user_requested_tenant" : null
    },
    "detector_type" : "SINGLE_ENTITY"
  }
}

Note there was only one filter type per detector.
3) upgrade to 1.3.2
4)update one filter. It won't allow you to save the updates. And exceptions from console:

Detected an unhandled Promise rejection. SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data[fatal_errors_service.tsx:120](http://localhost:5601/entry:core/src/core/public/fatal_errors/fatal_errors_service.tsx)
Uncaught (in promise) SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data
formikToFilterQueryhelpers.ts:84
formikToFilterQueryhelpers.ts:74
formikToDetectorDefinitionhelpers.ts:82
handleFormValidationDefineDetector.tsx:126
promise callback*handleFormValidationDefineDetector.tsx:123
onClickDefineDetector.tsx:214
React17
unstable_runWithPriorityscheduler.development.js:697
React19
unstable_runWithPriorityscheduler.development.js:697
React6
startrendering_service.tsx:55
startcore_system.ts:276
__osdBootstrap__osd_bootstrap.ts:56
onloadbootstrap.js:154
innerCbbootstrap.js:91
loadScriptbootstrap.js:81
loadbootstrap.js:100
loadbootstrap.js:87
onloadbootstrap.js:105
EventHandlerNonNull*bootstrap.js:48
[helpers.ts:84](http://localhost:5601/plugin:anomalyDetectionDashboards/plugins/anomaly-detection-dashboards-plugin/public/pages/ReviewAndCreate/utils/helpers.ts)

What is the expected behavior?
We should be able to apply the updates.

What is your host/environment?

• OS: ES 7.10, OS 1.3
• Plugins: AD

[kaituo]

Root cause: we didn't actually add filter type when loading old detector.

Impact: after upgrading from a version before OS 1.1 to later versions, we cannnot update detector using frontend unless resaving all filters (if any).

Fix: add filter type using new way when loading old detector. When saving, all filters are added filter type.

[kaituo]

fixed in #402