Add goroutine leak detection tests to Relayer, TXM, and LogPoller services

[ogtownsend]

• Use https://pkg.go.dev/go.uber.org/goleak to run leak tests for main services: relayer, txm, and logpoller
• Use chainlink-common/pkg/services/servicetest/run.go RunHealthy() to run tests: https://github.com/smartcontractkit/chainlink-common/blob/main/pkg/services/servicetest/run.go#L41
• (Locally only) Added a deliberate leak in txm.go with go func() { select {} }() and re-ran the test, confirmed it throws an error:

    logger.go:146: 17:45:16.550756000	DEBUG	Txm	confirmLoop: stopped	{"version": "(devel)@unset"}
    leak.go:23: found unexpected goroutines:
        [Goroutine 61 in state select (no cases), with github.com/smartcontractkit/chainlink-ton/pkg/txm.(*Txm).Start.func1.1 on top of the stack:
        github.com/smartcontractkit/chainlink-ton/pkg/txm.(*Txm).Start.func1.1()
        	/.../chainlink-ton/pkg/txm/txm.go:127 +0x1c
        created by github.com/smartcontractkit/chainlink-ton/pkg/txm.(*Txm).Start.func1 in goroutine 57
        	/.../chainlink-ton/pkg/txm/txm.go:127 +0xfc
        ]
--- FAIL: TestTxmLeak (0.75s)

[github-actions]

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[Copilot]

Pull request overview

Adds goroutine leak-detection coverage for TON core services by running real Start/Close paths under goleak, exercising key public APIs to ensure background loops and tickers shut down cleanly.

Changes:

• Add leak tests for txm, logpoller, and a relay “bundle” (txm + logpoller + balance monitor) using servicetest.RunHealthy() and tests.VerifyNoLeaks().
• Minor error formatting change in relay service (%q → %v) for transaction status.
• Update module/toolchain and dependencies (Go version, chainlink-common, go-plugin, and related indirect deps), plus .cursor/ added to .gitignore.

Reviewed changes

Copilot reviewed 5 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
pkg/txm/leak_test.go	New goleak-backed test that starts Txm, exercises Enqueue, and verifies clean shutdown.
pkg/logpoller/leak_test.go	New goleak-backed test that starts LogPoller, exercises filter ops + replay, and verifies clean shutdown.
pkg/relay/leak_test.go	New leak test that starts Txm + LogPoller + balance monitor together to mirror chain wiring.
pkg/relay/service.go	Adjust error formatting for unexpected transaction status.
go.mod	Bumps Go version and updates dependencies (incl. adding goleak indirect).
go.sum	Dependency checksum updates from the module changes.
.gitignore	Ignores .cursor/ directory.

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[ogtownsend]

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