test(code suggestion context): request code suggestion with open tabs

Description

Creates an E2E test which gets a code suggestion while other tabs are open, exercising sending file context

1. Open VSCode
2. Create a file with a list of constants
3. Create another file and reference constant from previous file
4. Check suggestion returns

Also bumps dependency wdio-vscode-service

Related Issues

Resolves #1627

How has this been tested?

Pipelines

What CHANGELOG entry will this MR create?

• fix: Bug fix fixes - a user-facing issue in production - included in changelog
• feature: New feature - a user-facing change which adds functionality - included in changelog
• BREAKING CHANGE: (fix or feature that would cause existing functionality to change) - should bump major version, mentioned in the changelog
• None - other non-user-facing changes