Comment out test/lint steps in composer-update workflow

[Copilot]

Per review feedback on #282, test/lint tools need to be isolated to their dedicated workflows until stable. The composer-update workflow was running phpunit, phpstan, and pint on every dependency update.

Changes

• Commented out test execution in .github/workflows/composer-update.yml

  • Changed to --group=smoke for future use
  • Disabled lines 81-85

• Commented out phpstan and pint steps

  • Disabled lines 87-88 (static analysis)
  • Disabled lines 90-91 (code formatting)

• Updated PR template

  • Marked checks as disabled in generated PR body

Workflow Scope

Test/lint tools now only run in dedicated manual workflows:

• phpunit.yml - Tests
• phpstan.yml - Static analysis
• pint.yml - Code formatting

Other workflows (quickstart.yml, release.yml, yarn-update.yml, crowdin-sync.yml) remain unchanged.

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[Copilot]

Pull request overview

This PR disables test and lint steps in the automated Composer dependency update workflow, isolating these quality checks to their dedicated manual workflows per feedback from #282. The workflow will continue to run security audits and create PRs for dependency updates, but without executing tests or code quality checks.

Key Changes:

• Commented out PHPUnit test execution, replacing --testsuite=Unit with --group=smoke for future use
• Commented out PHPStan static analysis step
• Commented out Laravel Pint code formatting step
• Updated PR template to reflect disabled checks with strikethrough formatting