Replace realloc with std::vector in IOThreadProc

[qorexdevs]

Replaces the raw realloc calls in Process::IOThreadProc() with std::vector for the handles/fhandles (Windows) and pfds (Linux) arrays. The vectors handle resizing and memory cleanup automatically -- the old raw pointers were never freed since the function loops forever, so this also fixes a minor leak if the thread ever exits.

fixes #10813

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[qorexdevs]

Thanks for the reminder. CLA check is still the only blocker here. I have not completed the Icinga CLA yet, I will sign it and reply on this thread so the bot can re-verify.

[qorexdevs]

Quick update: I still have not completed the CLA, so this PR cannot proceed from my side right now. To keep your queue clean, feel free to close it. I can reopen the same fix after CLA is signed.

[qorexdevs]

Closing this for now because I still have not completed the CLA. I will reopen the same fix after CLA is signed.