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Replace apr in llprocess with boost::process #5994

Description

@akleshchev

APR does not support unicode, has lacking exception coverage, lacking documentation, was made for win32 and whenever issues occur we are strugling to figure out what's going on. Additionally one of the tests periodically fails and it's hard to diagnose, as it only reproes on GH agents.

Test Plan

LLProcess is decently covered by units tests, so no specific testing needed. But viewer side media on a prim (and anything that uses cef) uses llprocess, leap is llprocess based. if you see any problems with either media or leap, llprocess might be to blame.

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