CI: Select node version to run CI against automatically (#7032)

## What's the problem this PR addresses?

Our CI are running against node versions that are not supported like 19.
The version list is manually managed, meaning we need to update it each
time Node releases new majors.

Also, in #6575 we pinned node versions for most CI processes to Node 22
to avoid 23.0 shenanigans.

## How did you fix it?

Add a step to fetch available Node versions and filter them down to
major versions that are even-numbered and >=18, or the latest major.
This needs to be updated only when we change our own supported Node
versions.

And essentially revert #6575 to use the current Node version

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Author: clemyan

.github/actions/prepare/action.yml

@@ -6,7 +6,7 @@ inputs:
   node-version:
     description: 'The version of Node.js to use'
     required: false
-    default: '22'
+    default: 'current'
 
 runs:
   using: composite

.github/workflows/integration-workflow.yml

@@ -209,12 +209,28 @@ jobs:
         name: vscode-zipfs
         path: ./packages/vscode-zipfs/vscode-zipfs-*.vsix
 
+  node-versions:
+    name: 'Acceptance test node versions'
+    outputs:
+      versions: ${{ steps.versions.outputs.versions }}
+    runs-on: ubuntu-latest
+    steps:
+    - id: versions
+      shell: bash
+      run: >
+        echo -n 'versions='
+        >> $GITHUB_OUTPUT
+
+        curl https://nodejs.org/dist/index.json |
+        jq -c '[.[0:1] + map(select(.lts)) | .[].version | capture("^v(?<major>\\d+)") | .major | tonumber] | unique | map(select(. >= 18))'
+        >> $GITHUB_OUTPUT
+
   acceptance:
     strategy:
       fail-fast: false
       matrix:
         # We run the ubuntu tests on multiple Node versions with 2 shards since they're the fastest.
-        node: [18, 19, 20, 21, 22]
+        node: ${{ fromJson(needs.node-versions.outputs.versions) }}
         platform: [[ubuntu, 22.04]]
         shard: ['1/2', '2/2']
         include:
@@ -239,7 +255,7 @@ jobs:
 
     name: '${{matrix.platform[0]}}-latest w/ Node.js ${{matrix.node}}.x (${{matrix.shard}})'
     runs-on: ${{matrix.platform[0]}}-${{matrix.platform[1]}}
-    needs: build
+    needs: [build, node-versions]
 
     # Permission required to produce a valid provenance statement during the tests
     # Only run inside the main repository; this may fail in master since it doesn't run in PRs from forks
@@ -249,10 +265,10 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - name: 'Use Node.js ${{matrix.node}}.x'
+    - name: 'Use Node.js ${{matrix.node}}'
       uses: actions/setup-node@v4
       with:
-        node-version: ${{matrix.node}}.x
+        node-version: ${{matrix.node}}
 
     - uses: actions/download-artifact@v4
       with: