Packaging changes

• keep upstream layout under /usr/share/composer
• keep only /usr/share/php/Composer/autoload.php for compatibility

Version 2.8.2 - 2024-10-29

• Fixed crash while suggesting providers if they have no description (#12152)
• Fixed issues creating lock files violating the schema in some circumstances (#12149)
• Fixed create-project regression in 2.8.1 when using path repos with relative paths (#12150)
• Fixed ctrl-C aborts not working inside text prompts (#12106)
• Fixed git failing silently when git cannot read a repo due to ownership violations (#12178)
• Fixed handling of signals in non-PHP binaries run via proxies (#12176)