test: enforce headless package manager conformance

[Eduardo Villalpando Mello (edvilme)]

Follow-up to #1704. Adds shared conformance coverage ensuring Pip, Conda, and Poetry do not prompt or show error UI during headless package operations, while failures still reject.

[Copilot]

Pull request overview

Adds unit-level “headless conformance” coverage to ensure package manager operations (Pip/Conda/Poetry) do not prompt for interactive input or display error UI when runHeadless: true, while still rejecting on failures. Also aligns Pip’s UI entry points with the existing VS Code wrapper APIs so they can be controlled/stubbed consistently in tests.

Changes:

• Added a shared unit test suite that exercises headless package-management behavior across Pip, Conda, and Poetry.
• Updated PipPackageManager to use withProgress / showErrorMessage from common/window.apis instead of vscode.window directly.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/test/managers/common/packageManagerHeadlessConformance.unit.test.ts	New conformance unit tests asserting headless runs do not prompt and do not show error UI, while failures still reject.
src/managers/builtin/pipPackageManager.ts	Switched from vscode.window to window API wrappers for progress + error UI to support headless/test stubbing.

Suppressed comments (1)

src/managers/builtin/pipPackageManager.ts:82

• New/updated user-facing strings in this hunk (progress titles like "Installing packages" and the error UI text/button) are not localized. The repo consistently localizes UI strings via l10n.t(...) or centralized string modules (e.g., CondaStrings from src/common/localize.ts). Please localize these strings so they’re translatable.

        await withProgress(
            {
                location: ProgressLocation.Notification,
                title: 'Installing packages',
                cancellable: true,
            },

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