[VSCode] [MCP] Add action to open workspace settings
Problem to solve
In [LS] [MCP] Support Multiple Configuration Sourc... (gitlab-org/editor-extensions/gitlab-lsp#1250 - closed), support was added for multiple configurations for MCP - at the workspace level and user level.
However, users can not easily access the workspace level config via a command palette action like the user configuration.
Proposal
Add a command palette action to open the workspace level configuration: GitLab MCP: Open Workspace Settings (JSON).
Links / references
Epic: [LS] Add Debug View for Model Context Protocol ... (gitlab-org/editor-extensions&181)
