Use local Ruby LSP executable on node tests (#3016)

### Motivation

Our node tests use the released version of the `ruby-lsp` gem, which is not a good choice. Yesterday, only after the release of v0.23, tests started failing and indicating a bug for Windows.

We need to run the node tests against the development version of the gem, so that we test the development version of the composed bundle logic.

### Implementation

Instead of installing `ruby-lsp` from rubygems, I started packaging the gem and installing that local version.

.github/workflows/ci.yml

@@ -118,12 +118,19 @@ jobs:
           chmod +x shadowenv
           sudo mv shadowenv /usr/local/bin/shadowenv
 
+      - name: Install gems for node tests
+        shell: bash
+        run: |
+          gem install debug
+          gem build ruby-lsp.gemspec
+          build_path=$(find . -name "ruby-lsp-*.gem")
+          gem install "$build_path"
+
       - name: Run tests
         working-directory: ./vscode
         env:
           DISPLAY: ":99.0"
         run: |
-          gem install ruby-lsp debug
           yarn --frozen-lockfile
           /usr/bin/Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
           yarn run test