[openstreetmap/openstreetmap-website] Require password on signup form submit (PR #6831)

[Stillhart]

### Description

Currently the `email` and the `display_name` have the basic html attribute `required="required"` which forces the users to enter something before submitting the form. It prevents them from submitting empty fields.

The `required="required"` is missing for both `password` and `password confirmation` fields, so I added it.

This change skips bootstrap and backend validations and uses the browsers builtin (limited) capabilities.
The user can still enter a too short password.

In case only rails validations after submit are desired, we might consider removing the `required="required"` attribute for the email and password.

Slightly related, html has `pattern` that can be used for client side validations, but the error messages are less helpful.

### How has this been tested?

I ran the existing testsuite and testing it myself in the browser.

### Related

Should there be more client side validations avoiding the blind submit and then fail? I may help with that.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/6831

-- Commit Summary --

  * add copilot instructions
  * Merge branch 'master' of https://github.com/openstreetmap/openstreetmap-website
  * require password on user sign up, same as email and username
  * run linter

-- File Changes --

    A .github/copilot-instructions.md (110)
    M app/views/users/new.html.erb (4)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6831.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6831.diff

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