Release notes for Grafana 8.3.0

Alerting: Prevent folders from being deleted when they contain alerts. #42307, @peterholmberg
Alerting: Show full preview value in tooltip. #42445, @peterholmberg
BarGauge: Limit title width when name is really long. #42346, @torkelo
CloudMonitoring: Avoid to escape regexps in filters. #41961, @andresmgot
CloudWatch: Add support for AWS Metric Insights. #42487, @sunker
TooltipPlugin: Remove other panels’ shared tooltip in edit panel. #42187, @mdvictor
Visualizations: Limit y label width to 40% of visualization width. #42350, @torkelo

Alerting: Clear alerting rule evaluation errors after intermittent failures. #42386, @gotjosh
Alerting: Fix refresh on legacy Alert List panel. #42322, @peterholmberg
Dashboard: Fix queries for panels with non-integer widths. #42420, @gabor
Explore: Fix url update inconsistency. #42288, @gabor
Prometheus: Fix range variables interpolation for time ranges smaller than 1 second. #42242, @ivanahuckova
ValueMappings: Fixes issue with regex value mapping that only sets color. #42311, @torkelo