tests: Fix restClientFixture test flaking (#4484)

Many e2e tests spins up 2 nodes, Node A and Node B: A observes it is currently round r, but  B is still on round r-1.
Node A then sends a tx with validity range (r, r+1000), and B then discards the tx since r-1 is outside
of the tx’s validity range.
Fixed by changing the validity window for transactions with default validity.

test/e2e-go/features/participation/participationRewards_test.go

@@ -347,8 +347,7 @@ func TestRewardRateRecalculation(t *testing.T) {
 	r.NoError(err)
 	minFee, minBal, err := fixture.MinFeeAndBalance(curStatus.LastRound)
 	r.NoError(err)
-	deadline := curStatus.LastRound + uint64(5)
-	fixture.SendMoneyAndWait(deadline, amountToSend, minFee, richAccount.Address, rewardsAccount, "")
+	fixture.SendMoneyAndWait(curStatus.LastRound, amountToSend, minFee, richAccount.Address, rewardsAccount, "")
 
 	blk, err := client.Block(curStatus.LastRound)
 	r.NoError(err)
@@ -373,8 +372,7 @@ func TestRewardRateRecalculation(t *testing.T) {
 
 	curStatus, err = client.Status()
 	r.NoError(err)
-	deadline = curStatus.LastRound + uint64(5)
-	fixture.SendMoneyAndWait(deadline, amountToSend, minFee, richAccount.Address, rewardsAccount, "")
+	fixture.SendMoneyAndWait(curStatus.LastRound, amountToSend, minFee, richAccount.Address, rewardsAccount, "")
 
 	rewardRecalcRound = rewardRecalcRound + consensusParams.RewardsRateRefreshInterval
 

test/framework/fixtures/restClientFixture.go

@@ -18,6 +18,7 @@ package fixtures
 
 import (
 	"fmt"
+	"github.com/algorand/go-algorand/data/basics"
 	"sort"
 	"time"
 	"unicode"
@@ -328,7 +329,8 @@ func (f *RestClientFixture) SendMoneyAndWait(curRound, amountToSend, transaction
 // SendMoneyAndWaitFromWallet is as above, but for a specific wallet
 func (f *RestClientFixture) SendMoneyAndWaitFromWallet(walletHandle, walletPassword []byte, curRound, amountToSend, transactionFee uint64, fromAccount, toAccount string, closeToAccount string) (txn v1.Transaction) {
 	client := f.LibGoalClient
-	fundingTx, err := client.SendPaymentFromWallet(walletHandle, walletPassword, fromAccount, toAccount, transactionFee, amountToSend, nil, closeToAccount, 0, 0)
+	// use one curRound - 1 in case other nodes are behind
+	fundingTx, err := client.SendPaymentFromWallet(walletHandle, walletPassword, fromAccount, toAccount, transactionFee, amountToSend, nil, closeToAccount, basics.Round(curRound).SubSaturate(1), 0)
 	require.NoError(f.t, err, "client should be able to send money from rich to poor account")
 	require.NotEmpty(f.t, fundingTx.ID().String(), "transaction ID should not be empty")
 	waitingDeadline := curRound + uint64(5)