multi: Add itest for funding timeout

This commit adds an integration test that
verifies the funding timeout behavior in the
funding manager, in dev/integration test.
Signed-off-by: Nishant Bansal <nishant.bansal.282003@gmail.com>

rpcserver.go

@@ -3850,9 +3850,21 @@ func (r *rpcServer) fetchPendingOpenChannels() (pendingOpenChannels, error) {
 		commitBaseWeight := blockchain.GetTransactionWeight(utx)
 		commitWeight := commitBaseWeight + witnessWeight
 
+		// The value of waitBlocksForFundingConf is adjusted in a
+		// development environment to enhance test capabilities.
+		// Otherwise, it is set to DefaultMaxWaitNumBlocksFundingConf.
+		waitBlocksForFundingConf := uint32(
+			lncfg.DefaultMaxWaitNumBlocksFundingConf,
+		)
+
+		if lncfg.IsDevBuild() {
+			waitBlocksForFundingConf =
+				r.cfg.Dev.GetMaxWaitNumBlocksFundingConf()
+		}
+
 		// FundingExpiryBlocks is the distance from the current block
-		// height to the broadcast height + MaxWaitNumBlocksFundingConf.
-		maxFundingHeight := funding.MaxWaitNumBlocksFundingConf +
+		// height to the broadcast height + waitBlocksForFundingConf.
+		maxFundingHeight := waitBlocksForFundingConf +
 			pendingChan.BroadcastHeight()
 		fundingExpiryBlocks := int32(maxFundingHeight) - currentHeight