[Custom threshold] Add group by filters to the custom threshold view …

…in app URL (#177016)

Resolves #173713

## Summary

This PR adds group by filters to the view in the app URL for the custom
threshold rule:


![image](https://github.com/elastic/kibana/assets/12370520/c84eecfc-b196-4268-acdd-57bae86ac4c4)

I also moved some types to the common folder and adjusted them to match
the reality.

## 🧪 How to test
- Create a custom threshold rule with group by
   - One with persisted data view
   - One with an ad-hoc data view
- Check the view in app link in the alerts table, you should also see
the group filters there.
- Check the view in app URL from the actions, it should also include the
group filters.

packages/kbn-alerts-as-data-utils/src/field_maps/legacy_experimental_field_map.ts

@@ -37,12 +37,12 @@ export const legacyExperimentalFieldMap = {
   },
   [ALERT_GROUP_FIELD]: {
     type: 'keyword',
-    array: false,
+    array: true,
     required: false,
   },
   [ALERT_GROUP_VALUE]: {
     type: 'keyword',
-    array: false,
+    array: true,
     required: false,
   },
 } as const;

packages/kbn-alerts-as-data-utils/src/schemas/generated/observability_apm_schema.ts

@@ -80,8 +80,8 @@ const ObservabilityApmAlertOptional = rt.partial({
   'kibana.alert.evaluation.values': schemaStringOrNumberArray,
   'kibana.alert.group': rt.array(
     rt.partial({
-      field: schemaString,
-      value: schemaString,
+      field: schemaStringArray,
+      value: schemaStringArray,
     })
   ),
   labels: schemaUnknown,

packages/kbn-alerts-as-data-utils/src/schemas/generated/observability_logs_schema.ts

@@ -78,8 +78,8 @@ const ObservabilityLogsAlertOptional = rt.partial({
   'kibana.alert.evaluation.values': schemaStringOrNumberArray,
   'kibana.alert.group': rt.array(
     rt.partial({
-      field: schemaString,
-      value: schemaString,
+      field: schemaStringArray,
+      value: schemaStringArray,
     })
   ),
 });

packages/kbn-alerts-as-data-utils/src/schemas/generated/observability_metrics_schema.ts

@@ -78,8 +78,8 @@ const ObservabilityMetricsAlertOptional = rt.partial({
   'kibana.alert.evaluation.values': schemaStringOrNumberArray,
   'kibana.alert.group': rt.array(
     rt.partial({
-      field: schemaString,
-      value: schemaString,
+      field: schemaStringArray,
+      value: schemaStringArray,
     })
   ),
 });

packages/kbn-alerts-as-data-utils/src/schemas/generated/observability_slo_schema.ts

@@ -77,8 +77,8 @@ const ObservabilitySloAlertOptional = rt.partial({
   'kibana.alert.evaluation.values': schemaStringOrNumberArray,
   'kibana.alert.group': rt.array(
     rt.partial({
-      field: schemaString,
-      value: schemaString,
+      field: schemaStringArray,
+      value: schemaStringArray,
     })
   ),
   'slo.id': schemaString,

packages/kbn-alerts-as-data-utils/src/schemas/generated/observability_uptime_schema.ts

@@ -81,8 +81,8 @@ const ObservabilityUptimeAlertOptional = rt.partial({
   'kibana.alert.evaluation.values': schemaStringOrNumberArray,
   'kibana.alert.group': rt.array(
     rt.partial({
-      field: schemaString,
-      value: schemaString,
+      field: schemaStringArray,
+      value: schemaStringArray,
     })
   ),
   'monitor.id': schemaString,