add a delete button to recorded testcase notifications (#1681)

## Checklist

- [ ] I have added
[tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)
- [x] I have updated the
[docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and
[cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)
- [x] I have not broken the cheatsheet

Author: josharian

packages/cursorless-engine/src/testCaseRecorder/TestCaseRecorder.ts

@@ -368,10 +368,20 @@ export class TestCaseRecorder {
         "testCaseSaved",
         "Cursorless test case saved.",
         "View",
+        "Delete",
       ).then(async (action) => {
         if (action === "View") {
           await ide().openTextDocument(outPath);
         }
+        if (action === "Delete") {
+          await fs.unlink(outPath, (err) => {
+            if (err) {
+              console.log("failed to delete ${outPath}: ${err}");
+            } else {
+              console.log("deleted ${outPath}");
+            }
+          });
+        }
       });
     }