fix(ci): restore explicit lintr and styler test dependencies (#1933)

Co-authored-by: Fred Wu <jianyun.wu@health.nsw.gov.au>

Author: Fred-Wu

.github/workflows/main.yml

@@ -48,12 +48,15 @@ jobs:
         uses: r-lib/actions/setup-r-dependencies@f9a764fea8d5c63df6ef9a5c7795bf7deb5d7e05 # v2
         with:
           working-directory: sess
-          # Keep Suggests for live plot tests. languageserver brings lintr/styler;
+          # Keep Suggests for live plot tests. Install lintr/styler explicitly
+          # for Interactive tests; they are optional languageserver dependencies.
           # renv is exercised by the Interactive library-isolation tests.
           extra-packages: |
             any::remotes
             any::pkgbuild
             any::languageserver
+            any::lintr
+            any::styler
             any::renv
       - run: pnpm run compile
       - name: Install bundled sess with prepared dependencies