Re-enable kotlin tests

Reverts https://github.com/github/codeql-action/pull/1473

pr-checks/checks/unset-environment.yml

@@ -12,9 +12,7 @@ steps:
       codeql-path: ${{ steps.init.outputs.codeql-path }}
   - name: Build code
     shell: bash
-    # Disable Kotlin analysis while it's incompatible with Kotlin 1.8, until we find a
-    # workaround for our PR checks.
-    run: env -i CODEQL_EXTRACTOR_JAVA_AGENT_DISABLE_KOTLIN=true PATH="$PATH" HOME="$HOME" ./build.sh
+    run: env -i PATH="$PATH" HOME="$HOME" ./build.sh
   - uses: ./../action/analyze
     id: analysis
     with:

pr-checks/sync.py

@@ -134,10 +134,7 @@ for file in os.listdir('checks'):
             'name': f"PR Check - {checkSpecification['name']}",
             'env': {
                 'GITHUB_TOKEN': '${{ secrets.GITHUB_TOKEN }}',
-                'GO111MODULE': 'auto',
-                # Disable Kotlin analysis while it's incompatible with Kotlin 1.8, until we find a
-                # workaround for our PR checks.
-                'CODEQL_EXTRACTOR_JAVA_AGENT_DISABLE_KOTLIN': 'true',
+                'GO111MODULE': 'auto'
             },
             'on': {
                 'push': {