test(testutil): increase wait times to reduce flakes (#8576)

testutil/duration.go

@@ -9,9 +9,9 @@ import (
 // Constants for timing out operations, usable for creating contexts
 // that timeout or in require.Eventually.
 const (
-	WaitShort     = 5 * time.Second
-	WaitMedium    = 10 * time.Second
-	WaitLong      = 15 * time.Second
+	WaitShort     = 10 * time.Second
+	WaitMedium    = 15 * time.Second
+	WaitLong      = 25 * time.Second
 	WaitSuperLong = 60 * time.Second
 )
 

testutil/duration_windows.go

@@ -7,10 +7,10 @@ import "time"
 //
 // Windows durations are adjusted for slow CI workers.
 const (
-	WaitShort     = 10 * time.Second
+	WaitShort     = 15 * time.Second
 	WaitMedium    = 20 * time.Second
-	WaitLong      = 30 * time.Second
-	WaitSuperLong = 60 * time.Second
+	WaitLong      = 35 * time.Second
+	WaitSuperLong = 120 * time.Second
 )
 
 // Constants for delaying repeated operations, e.g. in