Add one more tests about sidebar

Related to #8869

Author: cderv

tests/docs/smoke-all/website/sidebar/sidebar-title/.gitignore

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+/.quarto/
+_site

tests/docs/smoke-all/website/sidebar/sidebar-title/_quarto.yml

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+project:
+  type: website
+
+website:
+  title: "Test"
+
+  navbar:
+    left:
+      - href: index.qmd
+        text: Home
+
+  sidebar:
+    title: "Contents"
+    contents:
+      - section: About
+        contents:
+          - href: about.qmd
+            text: About
+
+format:
+  html: default

tests/docs/smoke-all/website/sidebar/sidebar-title/about.qmd

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+---
+title: "About page"
+_quarto:
+  tests: 
+    html:
+      ensureHtmlElements:
+        - 
+          - 'nav.navbar li.nav-item a.nav-link'
+          - 'nav#quarto-sidebar li.sidebar-item a.sidebar-link span.menu-text'
+          - 'nav#quarto-sidebar li.sidebar-item ul.sidebar-section'
+        - []
+---
+
+This is an about page that should also have a sidebar

tests/docs/smoke-all/website/sidebar/sidebar-title/index.qmd

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+---
+title: "Sidebar-title"
+_quarto:
+  tests: 
+    html:
+      ensureHtmlElements:
+        - 
+          - 'nav.navbar li.nav-item a.nav-link'
+          - 'nav#quarto-sidebar li.sidebar-item a.sidebar-link span.menu-text'
+          - 'nav#quarto-sidebar li.sidebar-item ul.sidebar-section'
+        - []
+---
+
+This test covers https://github.com/quarto-dev/quarto-cli/discussions/8869