Enhance test tool-chain for PHP code analysis

Add the following tools to tests for PHP packages:

• PHPStan
• Psalm
• Parallel-Lint

See also templates from Drupal's GitLab and this meta issue:

• https://gitlab.com/drupal-infrastructure/gitlab-acceleration/gitlabci/file-templates/-/blob/main/gitlab-ci/template.gitlab-ci.yml
• https://gitlab.com/drupal-infrastructure/gitlab-acceleration/gitlabci/file-templates/-/raw/main/includes/include.drupalci.variables.yml
• https://gitlab.com/drupal-infrastructure/gitlab-acceleration/gitlabci/file-templates/-/raw/main/includes/include.drupalci.workflows.yml

added Doing label

changed the description

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added To Do label and removed Doing label

mentioned in commit composer/plugin/drupal-development-environment@3809f7db

changed the description

Tests for PHP projects are now based on Drupal's GitLab CI templates, so that we don't need to extend that ourselves anylonger.

closed

removed To Do label