Add support for CLS to setConfigs mid-runtime

[chrmarti]

Migrated from microsoft/vscode-copilot-chat#5017
Original author: @andreamah

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Adds setConfigs to INESProvider and IInlineCompletionsProvider to ensure that configs can be added. With this, editor reloads don't need to happen for config to refresh.

[Copilot]

Pull request overview

Adds a mid-runtime configuration override mechanism to the Copilot “chat lib” facades (NES + inline completions) so CLS can refresh settings without requiring an editor reload.

Changes:

• Added setConfigs(overrides) to INESProvider and IInlineCompletionsProvider, and implemented it to apply overrides at runtime.
• Enhanced OverridableConfigurationService to support dynamic setConfig updates and emit configuration-change events.
• Updated DefaultsOnlyConfigurationService.setConfig signature to match IConfigurationService.

Show a summary per file

File	Description
extensions/copilot/src/platform/configuration/common/defaultsOnlyConfigurationService.ts	Aligns setConfig override signature with IConfigurationService.
extensions/copilot/src/lib/node/chatLibMain.ts	Adds setConfigs APIs and runtime override propagation for NES + inline completions; updates config override plumbing/events.

Copilot's findings

Comments suppressed due to low confidence (1)

extensions/copilot/src/lib/node/chatLibMain.ts:805

• setConfigs invokes this._configurationService.setConfig(...) without awaiting/handling the returned Thenable. To avoid potential unhandled rejections and ensure determinism for callers, please either handle the promise (e.g. void ...catch(...)) or make setConfigs return a Promise<void> and await the updates.

	setConfigs(overrides: Map<string, unknown>) {
		for (const [key, value] of overrides) {
			const config = globalConfigRegistry.configs.get(`${CopilotConfigPrefix}.${key}`);
			if (config) {
				this._configurationService.setConfig(config, value);
			}
		}
		if (this._completionsConfigProvider instanceof InMemoryConfigProvider) {
			this._completionsConfigProvider.setCopilotSettings(Object.fromEntries(overrides));
		}

• Files reviewed: 2/2 changed files
• Comments generated: 2