add manual testing page for Internal Heading Links

Author: byronluk

resources/sample_vaults/Tasks-Demo/Manual Testing/Internal Heading Links/Internal Heading Links.md

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+# Internal Heading Links
+
+```tasks
+filter by function task.file.filename.includes("internal_heading_links")
+```

resources/sample_vaults/Tasks-Demo/Manual Testing/Internal Heading Links/Other File.md

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+# Other File
+
+## Some Header

resources/sample_vaults/Tasks-Demo/Test Data/.obsidian/app.json

@@ -0,0 +1 @@
+{}

resources/sample_vaults/Tasks-Demo/Test Data/.obsidian/appearance.json

@@ -0,0 +1 @@
+{}

resources/sample_vaults/Tasks-Demo/Test Data/.obsidian/core-plugins.json

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+{
+  "file-explorer": true,
+  "global-search": true,
+  "switcher": true,
+  "graph": true,
+  "backlink": true,
+  "canvas": true,
+  "outgoing-link": true,
+  "tag-pane": true,
+  "properties": false,
+  "page-preview": true,
+  "daily-notes": true,
+  "templates": true,
+  "note-composer": true,
+  "command-palette": true,
+  "slash-command": false,
+  "editor-status": true,
+  "bookmarks": true,
+  "markdown-importer": false,
+  "zk-prefixer": false,
+  "random-note": false,
+  "outline": true,
+  "word-count": true,
+  "slides": false,
+  "audio-recorder": false,
+  "workspaces": false,
+  "file-recovery": true,
+  "publish": false,
+  "sync": true,
+  "webviewer": false
+}