feat: add 'hidden' option to 'coder_app' to hide app from UI (#14570)

Add 'hidden' property to 'coder_app' resource to allow hiding apps from the UI.

coderd/database/models.go

@@ -2843,6 +2843,8 @@ type WorkspaceApp struct {
 	External             bool               `db:"external" json:"external"`
 	// Specifies the order in which to display agent app in user interfaces.
 	DisplayOrder int32 `db:"display_order" json:"display_order"`
+	// Determines if the app is not shown in user interfaces.
+	Hidden bool `db:"hidden" json:"hidden"`
 }
 
 // A record of workspace app usage statistics