itest: use prefixed sub-tests

More sub-tests are needed in "coop close with external delivery" itest, which
would break the limit for 50 blocks mined. Turning it into prefixed itest.

Also used new exclusion approach in test "remote signer" where all the prefixed
tests are excluded.

itest/list_on_test.go

@@ -5,6 +5,7 @@ package itest
 import (
 	"fmt"
 
+	"github.com/lightningnetwork/lnd/fn/v2"
 	"github.com/lightningnetwork/lnd/lntest"
 )
 
@@ -642,10 +643,6 @@ var allTestCases = []*lntest.TestCase{
 		Name:     "sweep commit output and anchor",
 		TestFunc: testSweepCommitOutputAndAnchor,
 	},
-	{
-		Name:     "coop close with external delivery",
-		TestFunc: testCoopCloseWithExternalDelivery,
-	},
 	{
 		Name:     "payment failed htlc local swept",
 		TestFunc: testPaymentFailedHTLCLocalSwept,
@@ -720,6 +717,13 @@ func appendPrefixed(prefix string, testCases,
 	return testCases
 }
 
+// extractNames is used to extract tests' names from a group of prefixed tests.
+func extractNames(prefix string, subtestCases []*lntest.TestCase) []string {
+	return fn.Map(subtestCases, func(tc *lntest.TestCase) string {
+		return fmt.Sprintf("%s-%s", prefix, tc.Name)
+	})
+}
+
 func init() {
 	// Register subtests.
 	allTestCases = appendPrefixed(
@@ -762,6 +766,10 @@ func init() {
 	allTestCases = appendPrefixed(
 		"wallet", allTestCases, walletTestCases,
 	)
+	allTestCases = appendPrefixed(
+		"coop close with external delivery", allTestCases,
+		coopCloseWithExternalTestCases,
+	)
 
 	// Prepare the test cases for windows to exclude some of the flaky
 	// ones.