build.yml: drop unused GitHub output

Last usage of `${{ steps.properties.outputs.name }}` in GitHub Actions
workflow "Build" was removed in commit d8648e5 ("GitHub Actions general
performance refactoring", 2021-09-30).  Drop initialization of this
output from the step "Export Properties".

(cherry picked from commit 30506fba8ffae6d3d35d6bcdf264c18916b53803)

.github/workflows/build.yml

@@ -58,11 +58,9 @@ jobs:
         run: |
           PROPERTIES="$(./gradlew properties --console=plain -q)"
           VERSION="$(echo "$PROPERTIES" | grep "^version:" | cut -f2- -d ' ')"
-          NAME="$(echo "$PROPERTIES" | grep "^pluginName:" | cut -f2- -d ' ')"
           CHANGELOG="$(./gradlew getChangelog --unreleased --no-header --console=plain -q)"
 
           echo "version=$VERSION" >> $GITHUB_OUTPUT
-          echo "name=$NAME" >> $GITHUB_OUTPUT
           echo "pluginVerifierHomeDir=~/.pluginVerifier" >> $GITHUB_OUTPUT
           
           echo "changelog<<EOF" >> $GITHUB_OUTPUT