dashboards release v4.13.0

Improve Network Traffic Analysis Dashboard Performance
- [performance] Re-use panel queries, which gladly reduces the number of queries made to the backend, and ease maintenance
- [performance] Change Pie Charts query types from range to instant
- [performance] Set maximum datapoints to 500 and minimal interval to 2mn
- [ux] Change destination pie charts to only show top 10 destinations
- [ux] Change the top list panels to use pagination rather than only showing top 10 elements
- [ux] Change bottom graphs to use stacked lines and added list of values + total count
- [ux] Remove the per-namespace section which was merely a duplicate of the top one with additional namespace filter. All panels now have a namespace filter which default to all namespace, therefore keeping the old behavior of the top panels and also allowing behavior of the bottom ones at the same time.
- [ux] Add links between both Network Traffic Analysis dashboards
- [ux] Add Include non-namespaced toggle to filter/include non-namespaced network traffic
- [ux] Improve documentation panel
- [ux] Add annotations for CiliumNetworkPolicies events
- [ux] Change Legend set to “unknown” when no value is found
- [ux] Show percentage and all values in tooltip on destination panels
- [maintenance] Move subnets regex to a constant
NGINX Ingress controller dashboard: reworked variables
- removed app selector
- removed namespace selector
- added ingress namespace selector