Update kbn-flot-charts codeowners (#193351)

As best I can tell this was default assigned to operations during a
large refactor - #138965.

Operations is mostly disconnected from the UI. I'm proposing
transferring this over to area teams where flot is in use - stack
monitoring, canvas, and timelion.

.github/CODEOWNERS

@@ -476,7 +476,7 @@ src/plugins/files_management @elastic/appex-sharedux
 src/plugins/files @elastic/appex-sharedux
 packages/kbn-find-used-node-modules @elastic/kibana-operations
 x-pack/plugins/fleet @elastic/fleet
-packages/kbn-flot-charts @elastic/kibana-operations
+packages/kbn-flot-charts @elastic/kibana-presentation @elastic/stack-monitoring
 x-pack/test/ui_capabilities/common/plugins/foo_plugin @elastic/kibana-security
 packages/kbn-formatters @elastic/obs-ux-logs-team
 src/plugins/ftr_apis @elastic/kibana-core

packages/kbn-flot-charts/kibana.jsonc

@@ -1,5 +1,5 @@
 {
   "type": "shared-common",
   "id": "@kbn/flot-charts",
-  "owner": "@elastic/kibana-operations"
+  "owner": ["@elastic/kibana-presentation", "@elastic/stack-monitoring"]
 }