Add a test case for Page Bundle export using file-based flow

test/site/content-org/single-posts/page-bundle-file-based-flow.org

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+#+title: Page Bundle (File-based Flow)
+#+author:
+
+#+hugo_base_dir: ../../
+#+hugo_section: singles
+#+hugo_tags: file-based page-bundles
+
+#+hugo_bundle: page-bundle-file-based-flow
+#+export_file_name: index
+
+#+begin_description
+Post organized as a /Page Bundle/  exported using /file-based flow/.
+#+end_description
+
+This post is exported to a [[https://scripter.co/hugo-leaf-and-branch-bundles/#leaf-bundle][Page/Leaf Bundle structure]].

test/site/content/singles/page-bundle-file-based-flow/index.md

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++++
+title = "Page Bundle (File-based Flow)"
+description = "Post organized as a _Page Bundle_  exported using _file-based flow_."
+tags = ["file-based", "page-bundles"]
+draft = false
++++
+
+This post is exported to a [Page/Leaf Bundle structure](https://scripter.co/hugo-leaf-and-branch-bundles/#leaf-bundle).