test: reduce macOS integration flakiness

[eval-exec]

What problem does this PR solve?

Problem Summary:
Reduce flaky macOS integration failures in TransactionRelayConflict and SyncChurn.

What is changed and how it works?

What's Changed:

• use tx status checks in TransactionRelayConflict
• use a longer non-Linux sync timeout in SyncChurn

Related changes

Check List

Tests

• Integration test
• Manual test (add detailed scripts or steps below)

Manual test:

• TransactionRelayConflict
• SyncChurn

[Copilot]

Pull request overview

This PR fixes two sources of macOS CI integration test flakiness. TransactionRelayConflict was checking .transaction.is_some() which can be false even after the transaction is accepted into the tx pool — this is replaced with a tx status check. SyncChurn was timing out on slower non-Linux runners, so a configurable timeout mechanism is introduced with a longer value for non-Linux platforms.

Changes:

• Introduced waiting_for_sync_with_timeout in test/src/node.rs to allow callers to specify a custom sync timeout, while keeping the existing waiting_for_sync as a 120-second-default wrapper.
• Updated SyncChurn to use platform-specific sync timeouts (120s for Linux, 240s for non-Linux).
• Switched TransactionRelayConflict relay assertions from checking transaction.is_some() to checking tx_status.status for Pending | Proposed, which more reliably reflects the intended pool membership check.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
test/src/node.rs	Adds waiting_for_sync_with_timeout function; refactors waiting_for_sync to delegate to it with default timeout
test/src/specs/sync/sync_churn.rs	Adds platform-specific SYNC_TIMEOUT_SECS constants and uses the new timeout-aware sync function
test/src/specs/relay/transaction_relay.rs	Replaces .transaction.is_some() checks with tx_status.status pattern matching against `Pending

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

Comments suppressed due to low confidence (1)

test/src/specs/relay/transaction_relay.rs:335

• This assertion message refers to relaying to node1, but the condition being waited on is that node0 sees tx2 (re-broadcast from node1). Update the message to match the actual direction/target to avoid confusing failures.

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