Remove insights (#23952)

* removed server side

* Updated store layer

* unused import

* Updated autogenerated code template

* Updated tests

* lint fix

* unused translations

* webapp side

* Updated i18n

* lint fix:

* type fix

* Updated snapshots

* Removed insights from API specs

* updated e2e

* Updated e2e tests

* Updated e2e tests

* Removed insights tests

* Removed Insights as possible channel to load in sidebar from test

* Removed more insights tests

* More e2e fixed

* More cleanup

* Lint

* More cleanup in client4 and boards api

* More cleanup

* Fixes

* lint fix

---------

Co-authored-by: maria.nunez <maria.nunez@mattermost.com>
Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/store/layer_generators/opentracing_layer.go.tmpl

@@ -8,7 +8,6 @@ package opentracinglayer
 
 import (
 	"context"
-	"time"
 
 	"github.com/mattermost/mattermost/server/public/model"
 	"github.com/mattermost/mattermost/server/v8/platform/services/tracing"

server/channels/store/layer_generators/retry_layer.go.tmpl

@@ -9,7 +9,6 @@ package retrylayer
 import (
 	"context"
 	timepkg "time"
-	"time"
 
 	"github.com/lib/pq"
 	"github.com/mattermost/mattermost/server/public/model"