Show project dependency files in Project View

[Eduardo Villalpando Mello (edvilme)]

Contributes to #1042

This pull request introduces enhancements to the Python project management features, focusing on improved project dependency file detection and UI representation. The main changes include adding the ability for Python projects to discover their dependency files (like requirements.txt, pyproject.toml, requirements.in, or environment.yml), updating the tree view to display these files, and minor refactoring for clarity and consistency.

Python project dependency file detection and UI improvements:

• Added a discoverDependencyFiles method to the PythonProject interface and implemented it in PythonProjectsImpl, allowing detection of common dependency files at the project root or when the project URI points directly to a dependency file. [1] [2] [3]
• Updated the project tree view (ProjectView and treeViewItems.ts) to display the detected dependency file through ProjectDependencyFile as a child node under each project, with a command to open the file in the editor. [1] [2] [3] [4]

API and data model updates:

• Added a needsInstallation property to the PackageInfo interface and implemented it in PythonPackageImpl, defaulting to false. [1] [2]
• Minor API signature and import order cleanups for consistency, especially in PythonProjectManager and related files. [1] [2] [3] [4] [5] [6] [7] [8]

Test and formatting improvements:

• Added focused coverage for dependency-file discovery and the ProjectDependencyFile tree item in projectDependencyFiles.unit.test.ts and treeViewItems.unit.test.ts.

• Refactored test imports and improved assertion formatting for clarity in newScriptProject.unit.test.ts. [1] [2] [3] [4] [5] [6]

These changes collectively enhance the user experience by making project dependency files more discoverable and accessible, and improve the maintainability of the codebase.

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[Eduardo Villalpando Mello (edvilme)]

Related:
#194
#165
#146
#411
#1042
microsoft/vscode-python#25325

https://devblogs.microsoft.com/python/python-package-management-proposal/
(Somewhat related) microsoft/vscode-python#25080

[Eduardo Villalpando Mello (edvilme)]

Copilot resolve the merge conflicts in this pull request