Update account monitoring charts to have different aggregation type

[timotheeguerin]

• Sum for events count
• Avg for metrics
  

[codecov]

Codecov Report

Merging #1880 into master will increase coverage by 0.06%.
The diff coverage is 76.66%.

@@            Coverage Diff            @@
##           master   #1880      +/-   ##
=========================================
+ Coverage   62.84%   62.9%   +0.06%     
=========================================
  Files         991     992       +1     
  Lines       27039   27170     +131     
  Branches     4975    5004      +29     
=========================================
+ Hits        16992   17092     +100     
- Misses      10009   10040      +31     
  Partials       38      38

Impacted Files	Coverage Δ
.../services/monitoring/metrics/core-count-metrics.ts	0% <ø> (ø)	⬆️
...services/monitoring/metrics/task-states-metrics.ts	100% <ø> (ø)	⬆️
...services/monitoring/metrics/node-states-metrics.ts	100% <ø> (ø)	⬆️
...services/monitoring/metrics/failed-task-metrics.ts	0% <ø> (ø)	⬆️
.../app/components/node/browse/node-list.component.ts	21.21% <0%> (-0.67%)	⬇️
...nents/task/details/task-sub-tasks-tab.component.ts	15.78% <0%> (-0.43%)	⬇️
.../app/components/task/browse/task-list.component.ts	11.66% <0%> (-0.2%)	⬇️
...ount/browse/account-list/account-list.component.ts	78.57% <100%> (+0.52%)	⬆️
...ervices/monitoring/metrics/monitor-metrics-base.ts	92.15% <100%> (ø)	⬆️
...s/certificate/browse/certificate-list.component.ts	72.41% <100%> (+0.98%)	⬆️
... and 4 more

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