Bug 1686707 - Make rust mozprofile profile path public, r=webdriver-reviewers,whimboo

Depends on D101770

Differential Revision: https://phabricator.services.mozilla.com/D101771

testing/mozbase/rust/mozprofile/src/profile.rs

@@ -66,7 +66,7 @@ impl Profile {
 
 #[derive(Debug)]
 pub struct PrefFile {
-    path: PathBuf,
+    pub path: PathBuf,
     pub prefs: Preferences,
 }