Add mixed case test coverage for admin and SHOW keywords

[Copilot]

Adds missing test coverage for case variations of the newly blocked admin keywords (GRANT, DENY, REVOKE) and SHOW keyword, following the existing test pattern established for CREATE, SET, etc.

Added test cases:

• Mixed case variants: GrAnT, DeNy, ReVoKe, ShOw
• Lowercase variants: deny, revoke (GRANT and SHOW already had lowercase tests)

These tests verify the filter's case-insensitive keyword detection via strtoupper() normalization works correctly for all blocked operations.

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/JeroenDeDauw/FileFetcher/zipball/d9fadc0486ef690ce7dd9c6d32d6e5f2857bfd80
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/AAwKKf /usr/bin/composer install (http block)
• https://api.github.com/repos/JeroenDeDauw/PsrLogTestDoubles/zipball/201759e3779f0a68088c995a507c938966f2c413
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/AAwKKf /usr/bin/composer install (http block)
• https://api.github.com/repos/PHPCSStandards/PHP_CodeSniffer/zipball/d63cee4890a8afaf86a22e51ad4d97c91dd4579b
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/AAwKKf /usr/bin/composer install (http block)
• https://api.github.com/repos/PHPCSStandards/composer-installer/zipball/845eb62303d2ca9b289ef216356568ccc075ffd1
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/AAwKKf /usr/bin/composer install (http block)
• https://api.github.com/repos/composer/installers/zipball/12fb2dfe5e16183de69e784a7b84046c43d97e8e
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/AAwKKf /usr/bin/composer install (http block)
• https://api.github.com/repos/composer/pcre/zipball/b2bed4734f0cc156ee1fe9c0da2550420d99a21e
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/AAwKKf /usr/bin/composer install (http block)
• https://api.github.com/repos/php-fig/log/zipball/f16e1d5863e37f8d8c2a01719f5b34baa2b714d3
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/AAwKKf /usr/bin/composer install (http block)
• https://api.github.com/repos/php-http/discovery/zipball/82fe4c73ef3363caed49ff8dd1539ba06044910d
  • Triggering command: /usr/bin/php8.3 /usr/bin/php8.3 -n -c /tmp/AAwKKf /usr/bin/composer install (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)