fix: stop logging errors on cancel in notifier (#15186)

fixes https://github.com/coder/internal/issues/121

We shouldn't log errors when context is canceled, e.g. on shutdown.  This breaks our tests and alarms customers needlessly.

coderd/notifications/fetcher.go

@@ -7,19 +7,15 @@ import (
 	"text/template"
 
 	"golang.org/x/xerrors"
-
-	"cdr.dev/slog"
 )
 
 func (n *notifier) fetchHelpers(ctx context.Context) (map[string]any, error) {
 	appName, err := n.fetchAppName(ctx)
 	if err != nil {
-		n.log.Error(ctx, "failed to fetch app name", slog.Error(err))
 		return nil, xerrors.Errorf("fetch app name: %w", err)
 	}
 	logoURL, err := n.fetchLogoURL(ctx)
 	if err != nil {
-		n.log.Error(ctx, "failed to fetch logo URL", slog.Error(err))
 		return nil, xerrors.Errorf("fetch logo URL: %w", err)
 	}