[MM-53026] - Disabled insights by default (#23702)

* Insights disabled by default

* fixed tests

* fixed tests

---------

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

server/channels/app/plugin_api_test.go

@@ -183,7 +183,7 @@ func TestPluginAPIGetUserPreferences(t *testing.T) {
 	assert.Equal(t, user1.Id, preferences[0].UserId)
 	assert.Equal(t, model.PreferenceCategoryInsights, preferences[0].Category)
 	assert.Equal(t, model.PreferenceNameInsights, preferences[0].Name)
-	assert.Equal(t, "{\"insights_modal_viewed\":true}", preferences[0].Value)
+	assert.Equal(t, "{\"insights_modal_viewed\":false}", preferences[0].Value)
 
 	assert.Equal(t, user1.Id, preferences[1].UserId)
 	assert.Equal(t, model.PreferenceRecommendedNextSteps, preferences[1].Category)
@@ -271,7 +271,7 @@ func TestPluginAPIUpdateUserPreferences(t *testing.T) {
 	assert.Equal(t, user1.Id, preferences[0].UserId)
 	assert.Equal(t, model.PreferenceCategoryInsights, preferences[0].Category)
 	assert.Equal(t, model.PreferenceNameInsights, preferences[0].Name)
-	assert.Equal(t, "{\"insights_modal_viewed\":true}", preferences[0].Value)
+	assert.Equal(t, "{\"insights_modal_viewed\":false}", preferences[0].Value)
 
 	assert.Equal(t, user1.Id, preferences[1].UserId)
 	assert.Equal(t, model.PreferenceRecommendedNextSteps, preferences[1].Category)