Fixed: package manager update bugs

[gvatsal60]

This pull request refactors and improves the robustness of the .update.sh script's package and cache management logic. The main focus is on simplifying conditional logic, improving error handling, and making cache cleanup more reliable across different Linux distributions.

Improvements to Snap cache cleanup:

• The cleanup_snapd() function now checks if the Snap cache directory exists before attempting to clean it, and provides informative messages on success or failure. This prevents errors if the directory is missing and gives clearer feedback during cleanup.

Refactoring and simplification of package update logic:

• Removed unnecessary checks for empty cache directories before running package manager update commands for Debian, Alpine, and Arch, ensuring updates always run and simplifying the logic. [1] [2]
• For RHEL-based systems, consolidated and improved error handling by running makecache or check-update unconditionally and reporting errors immediately, rather than relying on indirect checks or exit codes.
• Standardized and clarified update messages and error handling across all supported distributions for better maintainability and user feedback. [1] [2]

[Copilot]

Pull Request Overview

This PR refactors the .update.sh script to improve robustness and error handling in package manager update logic. The changes focus on simplifying conditional logic by removing unnecessary cache directory checks and enhancing Snap cache cleanup functionality.

• Improved Snap cache cleanup with proper directory existence checks and error handling
• Removed unnecessary cache directory checks before running package manager updates
• Consolidated error handling for RHEL-based systems with immediate error reporting

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