build: do not use setup-node in build workflows

The setup-node GitHub Action installs problem matchers that happen
to match the warning message format of Visual Studio's C/C++ compiler.
This is resulting in all of our pull requests being annotated with
`Unchanged files with check annotations` which are confusing to new
contributors as they are not due to the changes in the pull request.

The action is used to run `npx envinfo` to dump some information into
the logs before the actual build. All GitHub hosted runners already
have a version of Node.js installed (12.x at the time of this commit)
which we can use to run `envinfo`. Remove the action to avoid using
the problematic problem matcher.

PR-URL: #31349
Fixes: #31347
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Rich Trott <rtrott@gmail.com>

.github/workflows/CI.yml

@@ -7,10 +7,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - name: Use Node.js 13
-        uses: actions/setup-node@v1
-        with:
-          node-version: 13.x
       - name: Environment Information
         run: npx envinfo
       - name: Build
@@ -19,10 +15,6 @@ jobs:
     runs-on: windows-latest
     steps:
       - uses: actions/checkout@v2
-      - name: Use Node.js 13
-        uses: actions/setup-node@v1
-        with:
-          node-version: 13.x
       - name: Environment Information
         run: npx envinfo
       - name: Install deps
@@ -33,10 +25,6 @@ jobs:
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v2
-      - name: Use Node.js 13
-        uses: actions/setup-node@v1
-        with:
-          node-version: 13.x
       - name: Environment Information
         run: npx envinfo
       - name: Build