fix(DbContextHealthCheck): propagate OperationCanceledExceptions instead of reporting unhealthy

Author: aomader

src/Middleware/HealthChecks.EntityFrameworkCore/src/DbContextHealthCheck.cs

@@ -41,7 +41,7 @@ public async Task<HealthCheckResult> CheckHealthAsync(HealthCheckContext context
 
             return new HealthCheckResult(context.Registration.FailureStatus);
         }
-        catch (Exception exception)
+        catch (Exception exception) when (exception is not OperationCanceledException || !cancellationToken.IsCancellationRequested)
         {
             return HealthCheckResult.Unhealthy(exception.Message, exception);
         }