fix: Remove username from email verification and password reset process (#8488)

BREAKING CHANGE: This removes the username from the email verification and password reset process to prevent storing personally identifiable information (PII) in server and infrastructure logs. Customized HTML pages or emails related to email verification and password reset may need to be adapted accordingly. See the new templates that come bundled with Parse Server and the [migration guide](https://github.com/parse-community/parse-server/blob/alpha/8.0.0.md) for more details.

public_html/invalid_verification_link.html

@@ -47,8 +47,8 @@
     window.onload = addDataToForm;
 
     function addDataToForm() {
-      var username = getUrlParameter("username");
-      document.getElementById("usernameField").value = username;
+      const token = getUrlParameter("token");
+      document.getElementById("token").value = token;
 
       var appId = getUrlParameter("appId");
       document.getElementById("resendForm").action = '/apps/' + appId + '/resend_verification_email'
@@ -60,7 +60,7 @@
     <div class="container">
       <h1>Invalid Verification Link</h1>
         <form id="resendForm" method="POST" action="/resend_verification_email">
-          <input id="usernameField" class="form-control" name="username" type="hidden" value="">
+          <input id="token" class="form-control" name="token" type="hidden" value="">
           <button type="submit" class="btn btn-default">Resend Link</button>
         </form>
     </div>