Fix: unbreak CI (autoloader suffix, Psalm cache, stray dependency)

[Rom1-B]

Checklist before requesting a review

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• I have performed a self-review of my code.
• I have added tests (when available) that prove my fix is effective or that my feature works.
• I have updated the CHANGELOG with a short functional description of the fix or new feature.
• This change requires a documentation update.

Description

• fixes # N/A
• Fixes CI failures by declaring a unique composer autoloader suffix, setting an explicit Psalm cache directory, and removing the stray glpi-project/tools dev dependency that duplicated the monorepo's own autoload-dev mapping.

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