Fix #40190: Block HTTP access to cron.php for security

[satishashilwar]

• Add security check at the top of pub/cron.php to block all HTTP requests
• Return 403 Forbidden with clear message for web access attempts
• Preserve CLI functionality with deprecation message pointing to bin/magento cron:run
• Add comprehensive unit tests for both HTTP blocking and CLI behavior
• Fixes security vulnerability and prevents runtime errors from HTTP execution
• Resolves TypeError: implode(): Argument Can you commit to repository a folder dev/tests/static ? #1

The fix ensures cron.php is not accessible via web requests while maintaining backward compatibility for any existing CLI usage (though deprecated).
fix - #40190

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• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

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[satishashilwar]

@magento run Unit Tests, Static Tests