Parse the Cargo package list by column instead of by regex

[Gabriel Dufresne (GabrielDuf)]

This pull request refactors and improves the way the Cargo package manager integration parses and processes the output of cargo install-update --list and cargo install --list. The changes introduce a more robust and testable parsing logic, replace brittle regular expressions with structured parsing, and add comprehensive unit tests to ensure correctness. Additionally, some minor improvements are made to package details handling.

Parsing and Data Model Improvements:

• Introduced a new CargoListEntry record and moved parsing logic for installed and updatable Cargo packages to a new file, CargoListParsing.cs, with robust handling of edge cases and malformed input. This includes new regexes and parsing methods for both update and install list outputs.
• Refactored the Cargo manager to use the new parsing logic and data model, replacing previous use of Match and regexes with CargoListEntry objects throughout the codebase. This improves maintainability and correctness, especially in edge cases.

Testing:

• Added a comprehensive new test suite CargoListParsingTests.cs, covering various real-world and edge case outputs from Cargo, ensuring the new parsing logic is robust and reliable.

Minor Improvements:

• Improved handling of package details in CargoPkgDetailsHelper.cs by using FirstOrDefault and null checks to avoid exceptions when version data is missing.

These changes make the Cargo integration more reliable, easier to maintain, and better tested.

[Copilot]

Pull request overview

Refactors Cargo package-list parsing into structured, testable logic and safely handles missing package-version metadata.

Changes:

• Adds column-based parsing for Cargo installed/update output.
• Integrates parsed entries with Cargo package discovery and fallback behavior.
• Adds comprehensive parser tests and null-safe package details handling.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
CargoListParsingTests.cs	Tests normal, malformed, prerelease, Git, and fallback output formats.
CargoPkgDetailsHelper.cs	Avoids exceptions when matching version metadata is absent.
CargoListParsing.cs	Defines the parsed entry model and parsing routines.
Cargo.cs	Uses structured entries for installed packages and updates.

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