Improve the new-user password reset page for password manager compatibility

[!TIP]

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Hi, I create new users with an email address (and no initial password).

The landing page is simple but misses the login / username of the new user. This can be a problem for the user but is certainly a missing information for password managers when storing the entry.

<form data-v-6bdd5975="" data-v-48234338="">
    <fieldset data-v-6bdd5975="">
        <p data-v-6bdd5975="">
            <label data-v-6bdd5975="" for="password" class="infield">New password</label> <input data-v-6bdd5975="" id="password" type="password" name="password" autocomplete="new-password" autocapitalize="none" spellcheck="false" required="required" placeholder="New password">
        </p> <!----> 
        <button data-v-5ee98a45="" data-v-79b727b6="" data-v-6bdd5975="" type="submit" class="button-vue button-vue--size-normal button-vue--icon-and-text button-vue--vue-primary button-vue--wide">Reset password
    </fieldset>
</form>

Suggested change: Add an either invisible or disabled (my preferred solution) box that shows the current login. Of course this cannot be changed by the user.

I think this improvement should be quite minimal and reduces friction with end users and password managers.

Note: I would be motivated to try to make a PR myself if the change is really minimal and if I'm allowed to. Please let me know if you endorse this, I know reviewing and maintaining community-contributed PRs is also an effort on your side!

Done when: I would test the new behavior against the keepass firefox extension, a clean chrome profile and a clean firefox profile

Start from the new-user password reset page and inspect the password form shown in the issue, including how the current login is made available to the page. Verify the updated behavior with the KeePass Firefox extension, a clean Chrome profile, and a clean Firefox profile; done means password managers can identify the user's login while it cannot be changed.