HPCC-35552 Improve logging when async connect fails

[ghalliday]

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Testing:

[ghalliday]

E.g.
000000E9 OPR 2026-01-02 16:48:27.729 3869613 3869674 "Failed to connect to 192.168.86.202:9001: EAFNOSUPPORT - Address family not supported by protocol family "

[github-actions]

Jira Issue: https://hpccsystems.atlassian.net//browse/HPCC-35552

Jirabot Action Result:
Assigning user: gavin.halliday@lexisnexisrisk.com
Workflow Transition To: Merge Pending
Updated PR

[Copilot]

Pull request overview

This PR improves error logging when asynchronous socket connections fail by adding a new utility function and enhanced error messages that include the target endpoint and the specific error cause.

Key Changes:

• Added getSocketErrorMessage() function to expose socket error message formatting
• Enhanced connection failure logging with endpoint and error details in async connect callback

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
system/jlib/jsocket.hpp	Declares new getSocketErrorMessage() function to expose error message formatting
system/jlib/jsocket.cpp	Implements getSocketErrorMessage() wrapper around existing SocketException error formatting
system/security/securesocket/socketutils.cpp	Adds detailed error logging when async connect/reconnect fails, including endpoint and error cause

[dcamper]

Nice addition.