Fix flaky e2e timestamp tests

Increase sleep time from 10ms to 1100ms to ensure timestamp precision works
consistently across databases with second-level granularity. Strengthen
AssertTimestampsOnUpdate to require strictly increasing timestamps instead of
allowing equal values.

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

e2e/console/processing_activity_test.go

@@ -556,7 +556,8 @@ func TestProcessingActivity_Timestamps(t *testing.T) {
 		initialCreatedAt := getResult.Node.CreatedAt
 		initialUpdatedAt := getResult.Node.UpdatedAt
 
-		time.Sleep(10 * time.Millisecond)
+		// Wait long enough for timestamp to change (database may have second precision)
+		time.Sleep(1100 * time.Millisecond)
 
 		updateQuery := `
 			mutation UpdateProcessingActivity($input: UpdateProcessingActivityInput!) {