Auth proxy: Ignore stale cache entries (#23979)

* Auth proxy: Retry without cache if failing to get user

pkg/bus/bus.go

@@ -174,20 +174,20 @@ func (b *InProcBus) AddEventListener(handler HandlerFunc) {
 	b.listeners[eventName] = append(b.listeners[eventName], handler)
 }
 
-// AddHandler attach a handler function to the global bus
-// Package level function
+// AddHandler attaches a handler function to the global bus.
+// Package level function.
 func AddHandler(implName string, handler HandlerFunc) {
 	globalBus.AddHandler(handler)
 }
 
-// AddHandlerCtx attach a handler function to the global bus context
-// Package level functions
+// AddHandlerCtx attaches a handler function to the global bus context.
+// Package level function.
 func AddHandlerCtx(implName string, handler HandlerFunc) {
 	globalBus.AddHandlerCtx(handler)
 }
 
-// AddEventListener attach a handler function to the event listener
-// Package level functions
+// AddEventListener attaches a handler function to the event listener.
+// Package level function.
 func AddEventListener(handler HandlerFunc) {
 	globalBus.AddEventListener(handler)
 }