Add test for shortcode resolution in title

Check also we do not duplicate website title

Author: cderv

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

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+/.quarto/
+**/*.quarto_ipynb

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

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+project:
+  type: website
+
+website:
+  title: "shortcode in title"
+  navbar:
+    left:
+      - href: index.qmd
+        text: Home
+      - about.qmd
+
+format: html
+
+custom-title-about: "YOLO"

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

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+---
+title: "{{< meta custom-title-about >}} Page"
+_quarto:
+  tests:
+    html:
+      ensureFileRegexMatches:
+      - ['<title>YOLO Page – shortcode in title</title>']
+---
+
+This page should have shortcode in title resolved from the `_quarto.yml` metadata.

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

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+---
+title: "shortcode in title"
+_quarto:
+  tests: 
+    html:
+     ensureFileRegexMatches:
+     - ['<title>shortcode in title</title>']
+---
+
+Title is same as website title, and should not be repeated.