feat: deprecate combine text and update templates (#7690)

* update template to use prompt

* [autofix.ci] apply automated fixes

* ✨ (generalBugs-shard-5.spec.ts): introduce new function addLegacyComponents to handle legacy components in tests

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: cristhianzl <cristhian.lousa@gmail.com>

src/backend/base/langflow/components/processing/combine_text.py

@@ -8,6 +8,7 @@ class CombineTextComponent(Component):
     description = "Concatenate two text sources into a single text chunk using a specified delimiter."
     icon = "merge"
     name = "CombineText"
+    legacy: bool = True
 
     inputs = [
         MessageTextInput(

src/frontend/tests/core/regression/generalBugs-shard-5.spec.ts

@@ -1,4 +1,5 @@
 import { expect, test } from "@playwright/test";
+import { addLegacyComponents } from "../../utils/add-legacy-components";
 import { awaitBootstrapTest } from "../../utils/await-bootstrap-test";
 import { zoomOut } from "../../utils/zoom-out";
 
@@ -14,6 +15,8 @@ test(
 
     await page.getByTestId("blank-flow").click();
 
+    await addLegacyComponents(page);
+
     await page.getByTestId("sidebar-search-input").click();
     await page.getByTestId("sidebar-search-input").fill("text input");
     await page.waitForSelector('[data-testid="inputsText Input"]', {