Add a test for global keypress with ACE editor focused

This is a regression test for
https://github.com/rust-lang/mdBook/issues/3064.

tests/gui/books/editor/book.toml

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+[book]
+title = "editor"
+language = "en"
+
+[output.html.playground]
+editable = true

tests/gui/books/editor/src/SUMMARY.md

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+# Summary
+
+- [Chapter 1](./chapter_1.md)
+- [Chapter 2](./chapter_2.md)

tests/gui/books/editor/src/chapter_1.md

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+# Chapter 1
+
+```rust,editable
+fn main() {
+    println!("Hello, world!");
+}
+```

tests/gui/books/editor/src/chapter_2.md

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+# Chapter 2

tests/gui/editor-keypress.goml

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+// Tests for global keypress handlers when ACE editor is in focus.
+// See https://github.com/rust-lang/mdBook/issues/3064
+
+go-to: |DOC_PATH| + "editor/chapter_1.html"
+
+click: ".ace_editor"
+press-key: "s"
+// Wait briefly to allow any event handlers triggered by the keypress to run.
+// Otherwise there is a race here since the wrapper is already display:none.
+wait-for: 200
+wait-for-css: ("#mdbook-search-wrapper", {"display": "none"})
+
+press-key: "?"
+wait-for: 200
+wait-for-css: ("#mdbook-help-container", {"display": "flex"})
+
+// Make sure arrow keys don"t navigate.
+press-key: "ArrowRight"
+wait-for: 200
+assert-window-property: ({"location": |DOC_PATH| + "editor/chapter_1.html"})
+press-key: "ArrowLeft"
+wait-for: 200
+assert-window-property: ({"location": |DOC_PATH| + "editor/chapter_1.html"})