feat: Set WebSocket as default in extension settings

Description

Sets websocket as default in the extension settings.

Related Issues

gitlab-org/editor-extensions/gitlab-lsp#1581

How has this been tested?

in User settings.json remove the entry with the selected connection type if you have one

e.g. "gitlab.duoAgentPlatform.connectionType": "grpc"

Run extension. In the extension settings not that the DAP connection type is selected as WebSockets

Screenshots (if appropriate)

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