Remove command palette POC (#24044)

* Revert "POC: Cross-team recent search (#20027)"

This reverts commit aa59c28b04, preserving
a few code tidyings unrelated to the original PR.

* Revert "Add feature flag for command palette (#20011)"

This reverts commit c78c5ce3f3.

server/public/model/feature_flags.go

@@ -43,8 +43,6 @@ type FeatureFlags struct {
 
 	InsightsEnabled bool
 
-	CommandPalette bool
-
 	PostPriority bool
 
 	// Enable WYSIWYG text editor
@@ -74,7 +72,6 @@ func (f *FeatureFlags) SetDefaults() {
 	f.NormalizeLdapDNs = false
 	f.GraphQL = false
 	f.InsightsEnabled = false
-	f.CommandPalette = false
 	f.CallsEnabled = true
 	f.PeopleProduct = false
 	f.DeprecateCloudFree = false