Remove usage of context.DeadlineExceeded

for internal decisions as this error is strongly used by other packages. By checking such wrapped errors the internal decision can be influenced accidentally.
In this case the retry mechanism checked if the error is context.DeadlineExceeded and assumed it would be created by the internal context. This assumption was wrong.

internal/runner/inactivity_timer.go

@@ -31,7 +31,10 @@ const (
 	TimerExpired  TimerState = 2
 )
 
-var ErrorRunnerInactivityTimeout DestroyReason = errors.New("runner inactivity timeout exceeded")
+var (
+	ErrorRunnerInactivityTimeout DestroyReason = errors.New("runner inactivity timeout exceeded")
+	ErrorExecutionTimeout                      = errors.New("execution timeout exceeded")
+)
 
 type InactivityTimerImplementation struct {
 	timer     *time.Timer