User with org viewer role permission fixes

A folder admin should be able to add permissions for folder/its dashboards

This resolves an issue where the add panel button was shown on the default home dashboard

[skip ci]

[skip ci]

* report active users in graphite stats

* use bus to publish system stats

* metrics: avoid using events unless we have to

this commit also changes the default interval
for updating the stats gauges. Seems like the old values
was a product of previous metrics implementation

[skip ci]

* fix: Row state is now ignored when looking for dashboawrd changes, had to fix bug in expand logic to make fix work. Also moved the ChangeTracker to it's own file and moved tests to jest, fixes #11208

* removed commented out log calls

improved ux for permission list

ux: sizing and positioning of dashboard settings menu icons

Revert "build: remove code cov"

Revert "removes codecov from frontend tests"

fix unconvert issues

bra should use the proper build script

In addition to closing #11578

[skip ci]

tsdb: improve $__timeFilter macro for postgres

* migrated dropdown-typeahead to ts

* removed console.logs

* added @ngInject