[e2e tests] Remove custom timeout value for coverage image (#6390)

There should no longer be a need for a custom timeout value in
testAntreaGracefulExit when coverage is enabled. The increased timeout
was not actually required for code coverage collection (which is quite
fast), but because of issues with the coverage-enabled image, which was
not handling signals correctly. After #6090, this should have been
fixed.

Signed-off-by: Antonin Bas <[email protected]>

test/e2e/basic_test.go

@@ -263,13 +263,6 @@ func testAntreaGracefulExit(t *testing.T, data *TestData) {
 	var gracePeriodSeconds int64 = 60
 	t.Logf("Deleting one Antrea Pod")
 	maxDeleteTimeout := 20 * time.Second
-	// When running Antrea instrumented binary to collect e2e coverage,
-	// we need to set the maxDeleteTimeout to a larger value
-	// since it needs to collect coverage data files
-	if testOptions.enableCoverage {
-		maxDeleteTimeout = 80 * time.Second
-	}
-
 	if timeToDelete, err := data.deleteAntreaAgentOnNode(nodeName(0), gracePeriodSeconds, defaultTimeout); err != nil {
 		t.Fatalf("Error when deleting Antrea Pod: %v", err)
 	} else if timeToDelete > maxDeleteTimeout {