Add workaround for captive core bug in integration tests

[2opremio]

Add a workaround for stellar/go#5342 , which is causing a race in integration tests.

See an instance of the problem at: https://github.com/stellar/soroban-rpc/actions/runs/9569819968/job/26383651448#step:10:110

 panic: Log in goroutine after TestArchiveUserAgent has completed: rpc="daemon" time="2024-06-18T17:58:16.017Z" level=info msg="\"peers\" : {" pid=16789 subservice=stellar-core


goroutine 13169 [running]:
testing.(*common).logDepth(0xc0006841a0, {0xc011bfe460, 0x6e}, 0x3)
	/opt/hostedtoolcache/go/1.22.4/x64/src/testing/testing.go:1028 +0x6d4
testing.(*common).log(...)
	/opt/hostedtoolcache/go/1.22.4/x64/src/testing/testing.go:1010
testing.(*common).Log(0xc0006841a0, {0xc0183379e8, 0x1, 0x1})
	/opt/hostedtoolcache/go/1.22.4/x64/src/testing/testing.go:1051 +0x7e
github.com/stellar/soroban-rpc/cmd/soroban-rpc/internal/integrationtest/infrastructure.testLogWriter.Write({0xc0006841a0?, {0x26ca1ce?, 0xc018337878?}}, {0xc005174700, 0x61, 0x0?})
	/home/runner/work/soroban-rpc/soroban-rpc/cmd/soroban-rpc/internal/integrationtest/infrastructure/test.go:409 +0x115
github.com/sirupsen/logrus.(*Entry).write(0xc00cac8b60)
	/home/runner/go/pkg/mod/github.com/sirupsen/[email protected]/entry.go:294 +0x269
github.com/sirupsen/logrus.(*Entry).log(0xc016bd8000, 0x4, {0xc005a96245, 0xb})
	/home/runner/go/pkg/mod/github.com/sirupsen/[email protected]/entry.go:252 +0xa6b
github.com/sirupsen/logrus.(*Entry).Log(0xc016bd8000, 0x4, {0xc018337e20, 0x1, 0x1})
	/home/runner/go/pkg/mod/github.com/sirupsen/[email protected]/entry.go:304 +0x8c
github.com/sirupsen/logrus.(*Entry).Info(...)
	/home/runner/go/pkg/mod/github.com/sirupsen/[email protected]/entry.go:321
github.com/stellar/go/support/log.(*Entry).Info(...)
	/home/runner/go/pkg/mod/github.com/stellar/[email protected]/support/log/entry.go:138
github.com/stellar/go/ingest/ledgerbackend.(*stellarCoreRunner).getLogLineWriter.func1()
	/home/runner/go/pkg/mod/github.com/stellar/[email protected]/ingest/ledgerbackend/stellar_core_runner.go:256 +0xa5d
created by github.com/stellar/go/ingest/ledgerbackend.(*stellarCoreRunner).getLogLineWriter in goroutine 13132
	/home/runner/go/pkg/mod/github.com/stellar/[email protected]/ingest/ledgerbackend/stellar_core_runner.go:221 +0x411
FAIL	github.com/stellar/soroban-rpc/cmd/soroban-rpc/internal/integrationtest	150.765s
FAIL