feat: add disambiguation suffixes for Python environments in env manager

[eleanorjboyd]

fixes #1196

[Copilot]

Pull request overview

This PR adds disambiguation suffixes to Python environment tree items when multiple environments share the same base name. The feature helps users distinguish between similarly-named virtual environments (e.g., multiple .venv folders) by displaying their parent folder names in the description field.

Changes:

• Introduced getEnvironmentParentDirName function to extract parent folder names from environment paths
• Added computeDisambiguationSuffixes to identify environments needing disambiguation and compute their suffixes
• Updated PythonEnvTreeItem to accept and display disambiguation suffixes in the description field

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/features/views/treeViewItems.ts	Added getEnvironmentParentDirName function and updated PythonEnvTreeItem constructor to support disambiguation suffixes
src/features/views/envManagersView.ts	Added getBaseName and computeDisambiguationSuffixes functions; integrated disambiguation logic into tree view rendering
src/test/features/views/treeViewItems.unit.test.ts	Added comprehensive test coverage for disambiguation suffix functionality and refactored existing tests with helper functions

[Copilot]

The logic for identifying venv folders relies on checking if a part starts with 'python', but this could incorrectly skip legitimate folder names that start with 'python' (e.g., 'python-utils', 'python_project'). Consider making this check more specific by checking for exact matches with common Python executable names like 'python', 'python3', 'python.exe', etc.

[Copilot]

The regex pattern [0-9.]+ could match invalid version strings like '3..12' or '...'. Consider using a more precise pattern like [0-9]+(?:\\.[0-9]+)* to match valid semantic version formats.

Suggested change

	return displayName.replace(/\s*\([0-9.]+\)\s*$/, '').trim();
	return displayName.replace(/\s*\([0-9]+(?:\.[0-9]+)*\)\s*$/, '').trim();