ENG-1965: Rename Template-Block-props buffer block to Template (editing)

Not plain "Template" because getSubTree({parentUid: node.type, key:
"Template"}) in NodeConfig.tsx and DiscourseNodeSuggestiveRules.tsx
text-matches children of the same parent the buffer is created under,
and auto-creates on miss - an exact "Template" buffer would collide
with the legacy template block lookup.

Author: sid597

apps/roam/src/components/settings/components/EphemeralBlocksPanel.tsx

@@ -14,7 +14,7 @@ import {
 import type { DiscourseNodeBaseProps } from "./BlockPropSettingPanels";
 
 const DEBOUNCE_MS = 250;
-const TEMPLATE_BUFFER_TEXT = "Template-Block-props";
+const TEMPLATE_BUFFER_TEXT = "Template (editing)";
 
 type DualWriteBlocksPanelProps = DiscourseNodeBaseProps & {
   uid: string;