chore: try to reduce windows shim test flakes

.gitignore

@@ -27,6 +27,7 @@ tap-testdir*/
 !/docs/
 !/index.js
 !/lib/
+!/libtap-settings.js
 !/LICENSE*
 !/map.js
 !/node_modules/

DEPENDENCIES.md

@@ -548,6 +548,7 @@ graph LR;
   npm-->remark-gfm;
   npm-->remark-github;
   npm-->remark;
+  npm-->rimraf;
   npm-->semver;
   npm-->sigstore-tuf["@sigstore/tuf"];
   npm-->spawk;

libtap-settings.js

@@ -0,0 +1,7 @@
+// use rimraf for tap recursive directory removal, so that
+// the windows tests don't flake with fs errors
+const { rimraf } = require('rimraf')
+module.exports = {
+  rmdirRecursiveSync: path => rimraf.sync(path),
+  rmdirRecursive: (path, cb) => rimraf(path).then(() => cb(), cb),
+}