fix: remove legacy prestissimo cleanup causing composer crash

[AaronFeledy]

Summary

Removes the legacy hirak/prestissimo cleanup block from install-composer.sh that was causing composer to crash during Laravel (and other recipe) builds.

Root Cause

Commit 01586fb moved composer installation from build_internal to build_as_root_internal, meaning install-composer.sh now runs as root instead of the service user (www-data).

The prestissimo cleanup block checked for a global composer.json at /var/www/.composer/ (www-data's dir), but composer global remove as root targets /root/.config/composer/composer.json — which doesn't exist. This path mismatch causes:

Changed current directory to /root/.config/composer
In JsonFile.php line 114:
  Could not read ./composer.json

This only triggers on rebuilds where /var/www/.composer/composer.json persists from a previous build via volume mounts.

Fix

Remove the prestissimo cleanup entirely. hirak/prestissimo was a Composer 1 parallel-download plugin that Composer 2 made obsolete in 2020. The cleanup code is no longer needed.

Testing

• Fresh lando start with Laravel recipe
• lando rebuild with persistent composer volumes
• Composer 1 and Composer 2 builds (neither affected by removal)

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Note

Low Risk
Low risk: removes an obsolete post-install cleanup step and only affects Composer install-time behavior; main risk is missing any previously relied-on global plugin removal in edge cases.

Overview
Fixes a Composer install crash by removing the legacy hirak/prestissimo global cleanup from scripts/install-composer.sh, avoiding failures when the script runs under a different user context.

Updates CHANGELOG.md to note the fix.

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