Auth forms contain hard-coded assumptions about field length

[Russell Keith-Magee]

The auth forms contain some hardcoded assumptions about the length of the username field.

In some cases, these are reasonable -- the user creation form should reasonably check the expected length etc of the username field.

However, in other cases, it's just busy work:

• LoginForm sets max_length=30.

• PasswordResetFrom sets max_length=75 on the email field.

While it's possible for these forms to be customized by the end user, we can avoid the need for 90% of users to need to do this customization by making the defaults a little more accepting -- a length of 254 chars in both cases would allow email addresses as login, without affecting the data integrity of the actual user model.

[Russell Keith-Magee <russell@…>]

In bfcda7781a886ab2b7b41937c0f49c088f58a3d7:

Fixed #19130 -- Made some of the auth forms more flexible for user models.

[Tim Graham <timograham@…>]

In d2333912:

Refs #19130 -- Added a test for AuthenticationForm.username max_length.

This will be a more useful regression test after refs #27515.