[backport core/1.39] Prevent serialization of progress text to prompt (#9223)

Backport of #9221 to `core/1.39`

Automatically created by backport workflow.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9223-backport-core-1-39-Prevent-serialization-of-progress-text-to-prompt-3136d73d3650818dbc8bed7f2a312ded)
by [Unito](https://www.unito.io)

Co-authored-by: AustinMroz <austin@comfy.org>

src/renderer/extensions/vueNodes/widgets/composables/useProgressTextWidget.ts

@@ -42,6 +42,7 @@ export function useTextPreviewWidget(
           widgetValue.value = typeof value === 'string' ? value : String(value)
         },
         getMinHeight: () => options.minHeight ?? 42 + PADDING,
+        serialize: false,
         read_only: true
       },
       type: inputSpec.type