Remove Node.js 18.x from GitHub CI template workflows

Remove 18.x from adapterTestVersions array in GitHub workflow template to complete Node.js 18 support removal.

Co-authored-by: Apollon77 <11976694+Apollon77@users.noreply.github.com>

Author: Copilot

templates/_github/workflows/test-and-release.yml.ts

@@ -15,7 +15,7 @@ const templateFunction: TemplateFunction = answers => {
 	const isGitHub = answers.target === "github";
 
 	const ltsNodeVersion = "20.x";
-	const adapterTestVersions = ["18.x", "20.x", "22.x"];
+	const adapterTestVersions = ["20.x", "22.x"];
 	const adapterTestOS = ["ubuntu-latest", "windows-latest", "macos-latest"];
 
 	const adapterName = answers.adapterName;

test/baselines/adapter_JS_JsonUI_ESLint_TypeChecking_Spaces_SingleQuotes_Apache-2.0/.github/workflows/test-and-release.yml

@@ -40,7 +40,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        node-version: [18.x, 20.x, 22.x]
+        node-version: [20.x, 22.x]
         os: [ubuntu-latest, windows-latest, macos-latest]
 
     steps:

test/baselines/adapter_JS_React/.github/workflows/test-and-release.yml

@@ -40,7 +40,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        node-version: [18.x, 20.x, 22.x]
+        node-version: [20.x, 22.x]
         os: [ubuntu-latest, windows-latest, macos-latest]
 
     steps:

test/baselines/adapter_TS_ESLint_Tabs_DoubleQuotes_MIT/.github/workflows/test-and-release.yml

@@ -41,7 +41,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        node-version: [18.x, 20.x, 22.x]
+        node-version: [20.x, 22.x]
         os: [ubuntu-latest, windows-latest, macos-latest]
 
     steps:

test/baselines/adapter_TS_React/.github/workflows/test-and-release.yml

@@ -41,7 +41,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        node-version: [18.x, 20.x, 22.x]
+        node-version: [20.x, 22.x]
         os: [ubuntu-latest, windows-latest, macos-latest]
 
     steps:

test/baselines/portal-github/.github/workflows/test-and-release.yml

@@ -41,7 +41,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        node-version: [18.x, 20.x, 22.x]
+        node-version: [20.x, 22.x]
         os: [ubuntu-latest, windows-latest, macos-latest]
 
     steps: