refactor(tests): use jest-mock-vscode and reorganize test structure

[9romise]

• re-export VS Code api from jest-mock-vscode
• move files to tests/utils
• use real filesystem instead of custom mock

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📝 Walkthrough

Walkthrough

This PR removes the mocked filesystem test infrastructure and updates test imports. It deletes tests/__mocks__/filesystem.ts and the tests/filesystem.test.ts suite, refactors tests/__mocks__/vscode.ts to export a wider set of VS Code symbols via a single destructured vscode export, adjusts multiple test import paths (e.g. memoize, package, version), and updates tests/utils/resolve.test.ts to use real filesystem URIs (Uri.joinPath) instead of the removed mockFileSystem.

Possibly related PRs

• refactor: extract walkAncestors, findNearestFile #41: Modifies resolve utilities/tests and migrates tests to use real filesystem lookups (findNearestFile / walkAncestors), aligning with removal of the filesystem mock.
• feat: add openFileInNpmx command for node_modules files #34: Changes the same test mock modules (tests/__mocks__/vscode.ts and tests/__mocks__/filesystem.ts), touching how VS Code symbols and workspace.fs were mocked.

🚥 Pre-merge checks | ✅ 1

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description check	✅ Passed	The pull request description accurately reflects the changeset, documenting three key modifications: re-exporting VS Code API from jest-mock-vscode, reorganising test files, and replacing custom filesystem mock with real filesystem.

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Actionable comments posted: 2