Missing validation for minimum character requirement in nickname field

[VolodLytvynenko]

Steps:

1. UserA on the profile page of UserB
2. Tap three dots -> tap 'add nickname'
3. Enter less than 5 chars into nickname field

Actual result:

No validation is applied

Expected result:

'Minimum 5 characters' validation message should be shown

reference to https://discord.com/channels/624634427930312714/1026813762910564393/1219632940431048724