feat: add @inquirerer/test package and skip logic for checkForUpdates

[pyramation]

Summary

This PR adds two features to dev-utils:

1. New @inquirerer/test package (v1.0.0) - Testing utilities for inquirerer-based CLI applications:

• createTestEnvironment() - Creates mock stdin/stdout/TTY streams for testing CLI prompts
• KEY_SEQUENCES - Constants for simulating keypresses (ENTER, UP_ARROW, DOWN_ARROW, etc.)
• normalizePackageJsonForSnapshot() - Normalizes dependency versions for stable snapshots
• normalizePathsForSnapshot() / normalizeDatesForSnapshot() - Cross-platform snapshot helpers

2. Skip logic for checkForUpdates in @inquirerer/utils:

• Auto-skips in CI environments (CI=true)
• Respects INQUIRERER_SKIP_UPDATE_CHECK env var (generic skip)
• Respects {TOOLNAME}_SKIP_UPDATE_CHECK env var (e.g., PGPM_SKIP_UPDATE_CHECK)
• New force: true option to bypass skip logic
• Returns skipped and skipReason fields in result

Review & Testing Checklist for Human

• Verify Jest dependency handling in harness.ts - The code uses jest.fn() directly but Jest is marked as optional peer dependency. Test that importing the package works correctly in both Jest and non-Jest environments.
• Test shouldSkipUpdateCheck with env var combinations - Verify CI detection, generic skip, and tool-specific skip all work correctly. Check that toEnvVarName() properly converts tool names like "my-cli" to "MY_CLI".
• Verify force: true bypasses all skip logic - Ensure update checks can still be forced in CI when needed.
• Check for dead code - Line 51 in harness.ts declares originalCreateInterface but never uses it.

Recommended test plan:

1. Run pnpm build and pnpm test in dev-utils
2. Manually test checkForUpdates with CI=true, INQUIRERER_SKIP_UPDATE_CHECK=1, and force: true
3. Import @inquirerer/test in a test file and verify createTestEnvironment() works with inquirerer prompts

Notes

The @inquirerer/test package extracts and generalizes test utilities that were duplicated in pgpm/cli/test-utils/cli.ts and packages/cli/test-utils/cli.ts in the constructive repo.

After this PR is merged and published, a follow-up PR to constructive will update checkForUpdates calls to remove the manual !process.env.CI checks since that logic is now baked into the utility.

Link to Devin run: https://app.devin.ai/sessions/e5018850caff45ce8a126331548d69bc
Requested by: Dan Lynch (@pyramation)

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