[MM-52969] Revert "MM-51482_Create Apps Category and link to bots DM (#22918)" (#23647)

* Revert "MM-51482_Create Apps Category and link to bots DM (#22918)"

This reverts commit 1051925eec.

* Revert "MM-51711_Feature flag: APPS sidebar category (#22766)"

This reverts commit 9156205178.

server/public/model/feature_flags.go

@@ -75,8 +75,6 @@ type FeatureFlags struct {
 
 	DeprecateCloudFree bool
 
-	AppsSidebarCategory bool
-
 	CloudReverseTrial bool
 }
 
@@ -106,7 +104,6 @@ func (f *FeatureFlags) SetDefaults() {
 	f.WysiwygEditor = false
 	f.OnboardingAutoShowLinkedBoard = false
 	f.OnboardingTourTips = true
-	f.AppsSidebarCategory = false
 	f.CloudReverseTrial = false
 }