Avoid 0ms interval rescheduling in configuration service (microsoft#259524)

* Fixes microsoft#259517

Cherry-pick d38eb0f from PR microsoft#259518.

Avoid 0ms interval rescheduling in ConfigurationDefaultOverridesContribution.
When ASSIGNMENT_REFETCH_INTERVAL is 0, skip rescheduling to prevent
infinite loop of immediate scheduler execution.

Co-authored-by: hediet <2931520+hediet@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: hediet <2931520+hediet@users.noreply.github.com>

Author: Copilot

src/vs/workbench/services/configuration/browser/configurationService.ts

@@ -1353,7 +1353,10 @@ class ConfigurationDefaultOverridesContribution extends Disposable implements IW
 
 		this.autoRefetchExperimentalSettingsScheduler = new RunOnceScheduler(() => {
 			this.processExperimentalSettings(this.autoRefetchExperimentalSettings, true);
-			this.autoRefetchExperimentalSettingsScheduler.schedule();
+			if (ASSIGNMENT_REFETCH_INTERVAL !== 0) {
+				// TODO@sandy081 wait for the promise returned by processExperimentalSettings to avoid unbounded queuing
+				this.autoRefetchExperimentalSettingsScheduler.schedule();
+			}
 		}, ASSIGNMENT_REFETCH_INTERVAL);
 
 		this.updateDefaults();