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>

e2e-tests/cypress/tests/support/ui/sidebar_left.ts

@@ -116,11 +116,6 @@ function uiGetSidebarThreadsButton(): ChainableT<JQuery> {
 }
 Cypress.Commands.add('uiGetSidebarThreadsButton', uiGetSidebarThreadsButton);
 
-function uiGetSidebarInsightsButton(): ChainableT<JQuery> {
-    return cy.get('#sidebar-insights-button').should('be.visible');
-}
-Cypress.Commands.add('uiGetSidebarInsightsButton', uiGetSidebarInsightsButton);
-
 Cypress.Commands.add('uiGetChannelSidebarMenu', (channelName, isChannelId = false) => {
     cy.uiGetLHS().within(() => {
         if (isChannelId) {
@@ -273,8 +268,6 @@ declare global {
             uiGetSystemConsoleMenu: typeof uiGetSystemConsoleMenu;
 
             uiGetSidebarThreadsButton: typeof uiGetSidebarThreadsButton;
-
-            uiGetSidebarInsightsButton: typeof uiGetSidebarInsightsButton;
         }
     }
 }