Use workspace/configuration response for providing the manual configuration path

[siketyan]

See biomejs/biome#5089

Biome v2.0 will drop the --config-path option from the CLI, so we need to use workspace/configuration LSP response instead.

[nhedger]

It's worth noting that we won't be able to specify a custom configuration file for specific projects if we have multiple projects in a workspace folder, as settings cannot be specified at a level lower than workspace folders.

[siketyan]

@nhedger I think specifying one configuration file for a workspace folder still makes sense. In my understanding, biome-vscode currently doesn't have a way to use a manual configuration file in the workspace, as configFile option was removed recently.

[nhedger]

Correct. Yeah for sure! Was just pointing out the fact just so we're aware of it when implementing