Always apply workspace URI configuration to indexer (#3034)

### Motivation

Fixes #2365

We regressed on the fix to use the workspace URI given by the editor as the entry point for indexing. The changes to receive indexing configurations from the editor started returning early if no configurations are passed, but we still need to apply the workspace URI even if the user didn't specify any other configs.

### Implementation

Started applying the workspace URI to the indexing config every time.

### Automated Tests

Added a test that reproduces the bug.

lib/ruby_lsp/server.rb

@@ -1260,10 +1260,10 @@ def process_indexing_configuration(indexing_options)
         return
       end
 
-      return unless indexing_options
-
       configuration = @global_state.index.configuration
       configuration.workspace_path = @global_state.workspace_path
+      return unless indexing_options
+
       # The index expects snake case configurations, but VS Code standardizes on camel case settings
       configuration.apply_config(indexing_options.transform_keys { |key| key.to_s.gsub(/([A-Z])/, "_\\1").downcase })
     end

test/server_test.rb

@@ -225,6 +225,21 @@ def test_formatting_errors_push_window_notification
     )
   end
 
+  def test_applies_workspace_uri_to_indexing_configs_even_if_no_configs_are_specified
+    @server.process_message({
+      id: 1,
+      method: "initialize",
+      params: {
+        initializationOptions: {},
+        capabilities: { general: { positionEncodings: ["utf-8"] } },
+        workspaceFolders: [{ uri: URI::Generic.from_path(path: "/fake").to_s }],
+      },
+    })
+
+    index = @server.instance_variable_get(:@global_state).index
+    assert_equal("/fake", index.configuration.instance_variable_get(:@workspace_path))
+  end
+
   def test_returns_nil_diagnostics_and_formatting_for_files_outside_workspace
     capture_subprocess_io do
       @server.process_message({
@@ -233,7 +248,7 @@ def test_returns_nil_diagnostics_and_formatting_for_files_outside_workspace
         params: {
           initializationOptions: { enabledFeatures: ["formatting", "diagnostics"] },
           capabilities: { general: { positionEncodings: ["utf-8"] } },
-          workspaceFolders: [{ uri: URI::Generic.from_path(path: Dir.pwd).to_standardized_path }],
+          workspaceFolders: [{ uri: URI::Generic.from_path(path: Dir.pwd).to_s }],
         },
       })
     end