feat: Add an ability to delete personal account

[liza-veis]

What feature?

• [x] Add an ability to delete personal account.
• [x] On Delete button click, there should be a confirmation modal.
• [x] After the confirmation user account should be deleted (soft delete).

Screenshots

[VeronikaHordus]

User story

As a user, I want to delete my personal account so I can permanently remove my data from the platform If there is no longer needed for their presence.

Access criteria

1. The Delete account button is accessable at the buttom of the user's Profile page.
2. The Confirmation modal states that this action is irreversible.
3. The final sentence in the modal instructs the user to click "Confirm" to proceed.
4. The user must click a final confirmation button, labeled "Confirm," to trigger the account deletion.
5. Upon confirmation, user is being redirected to the Sign In page.
6. An attempt to log in with deleted account should result an "Invalid credentials" toast notification (as for Non-registered users).

[VeronikaHordus]

The functionality works appropriate 👍 Thank you ! I am not fully satisfied with the text on confirmation modal and confirmation button, but i will keep it in feature request.