fixed typing issues

Author: gmmorris

x-pack/plugins/task_manager/server/monitoring/capacity_estimation.ts

@@ -10,7 +10,7 @@ import stats from 'stats-lite';
 import { JsonObject } from 'src/plugins/kibana_utils/common';
 import { RawMonitoringStats, RawMonitoredStat, HealthStatus } from './monitoring_stats_stream';
 import { AveragedStat } from './task_run_calcultors';
-import { TaskPersistence, TaskPersistenceTypes } from './task_run_statistics';
+import { TaskPersistenceTypes } from './task_run_statistics';
 
 export interface CapacityEstimationStat extends JsonObject {
   observed: {

x-pack/plugins/task_manager/server/routes/health.test.ts

@@ -355,6 +355,7 @@ function mockHealthStats(overrides = {}) {
           load: [0, 100, 75],
           execution: {
             duration: {},
+            duration_by_persistence: {},
             persistence: [],
             result_frequency_percent_as_number: {},
           },