Add tests for #7318

#7318 was fixed by #8430 but with no test. This is adding tests that fails without #8430 fix.

This way we won't regress in the future.

Author: cderv

tests/docs/smoke-all/issues/7318-shortcode-title/.gitignore

@@ -0,0 +1,2 @@
+/.quarto/
+**/*.quarto_ipynb

tests/docs/smoke-all/issues/7318-shortcode-title/_quarto.yml

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+project:
+  title: "Project"
+  type: website
+format:
+  html:
+    template-partials:
+      - metadata.html

tests/docs/smoke-all/issues/7318-shortcode-title/document1.qmd

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+---
+title: "Document 1"
+_quarto:
+  tests:
+    html:
+      ensureFileRegexMatches:
+      - ['<title>This text will be overwritten.</title>']
+---
+
+This is sample document 1.

tests/docs/smoke-all/issues/7318-shortcode-title/document2.qmd

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+---
+title: "Document 2"
+format:
+  html:
+    template-partials:
+      - metadata.html
+_quarto:
+  tests:
+    html:
+      ensureFileRegexMatches:
+      - ['<title>This text will be overwritten.</title>']
+---
+
+This is sample document 2.
+
+The `format` metadata is redundant with that in `_quarto.yml`,
+but it's here to show that if you remove those options from `_quarto.yml`
+but leave them here, the bug will remain the same.

tests/docs/smoke-all/issues/7318-shortcode-title/document3.qmd

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+---
+_quarto:
+  tests:
+    html:
+      ensureFileRegexMatches:
+      - ['<title>This text will be overwritten.</title>']
+---
+
+This is sample document 3, and this one actually works correctly!

tests/docs/smoke-all/issues/7318-shortcode-title/metadata.html

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+<title>This text will be overwritten.</title>
+<!-- I'm not actually trying to have two titles; this just shows the issue more clearly. -->
+<!-- Also, these comments show that the rest of this file's contents will be copied over faithfully. -->