Add tests for plausible snippets

Author: cderv

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

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

tests/docs/smoke-all/website/plausible-analytics/.gitignore

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+project:
+  type: website
+
+website:
+  title: "Plausible Custom Script Test"
+  plausible-analytics: |
+    <script async src="https://plausible.io/js/pa-TESTCODE123.js"></script>
+    <script>
+      window.plausible=window.plausible||function(){(plausible.q=plausible.q||[]).push(arguments)};
+      plausible.init()
+    </script>

tests/docs/smoke-all/website/plausible-analytics/_quarto.yml

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+---
+title: "Plausible Custom Script Test"
+_quarto:
+  tests:
+    html:
+      ensureHtmlElements:
+        -
+          - 'script[async][src="https://plausible.io/js/pa-TESTCODE123.js"]'
+      ensureFileRegexMatches:
+        - ['window\.plausible', 'plausible\.init']
+---
+
+This test verifies that Plausible Analytics with custom script (pa-XXXX.js format)
+and initialization code is correctly injected into the HTML output.

tests/docs/smoke-all/website/plausible-analytics/index.qmd

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+/.quarto/
+*.html
+*.json
+site_libs/
+**/*.quarto_ipynb