📎 Support overriding configuration per workspace on LSP

[siketyan]

Description

Continues #5084

Biome LSP server already supports configuration per workspace, but the config file is automatically found from the current directory and cannot be overriden. It also have --config-path CLI flag, but it overrides the configuration on every workspace.

This task is to support overriding the configuration for each workspace on LSP. I am ready to work on this and this issue is only for tracking.

TODOs:

• feat(lsp): allow overriding the configuration path from LSP workspaces #5093
• Add a new --fallback-config-path CLI flag for the last resort to the LSP server/proxy
• Deprecate and remove the existing --config-path CLI flag

[nhedger]

FYI, --config-path is currently being used by the v3 prerelease extension for VS Code

[ematipico]

I believe --config-path still makes sense (for now). It has different semantics.

Let's keep it for now and see if it makes sense to keep it or not.

[siketyan]

@nhedger @ematipico
Thank you for letting me know about that. I'll keep --config-path for now.

[nhedger]

@siketyan FYI, we've finally decided to remove --config-path from the pre-release extension.