Root admins action to ban/unban accounts

[Betree]

User story

We have 2 frequent requests on support:

1. To ban accounts (usually spammers)
2. To un-ban them (false positive that got banned then fail to login)

These requests currently have to be handled by engineers. I would like us to empower the rest of the support team for them to be able to handle these actions.

Best solution for this problem

On https://opencollective.com/opencollective/root-actions...

1. Implement the ability to ban accounts. This should probably be grouped in a single interface with Root admin action to enable/disable features for an account #4627, Root admin action to delete accounts #4684, Reset 2FA from root admin dashboard #4714 and Root admin action to change the status of a tax form #4805.
   When banning an account, we should prompt a modal to list all the associated accounts that will be banned with it (and optionally checkboxes to pick which ones should be)
2. Add a "banned accounts" section, listing banned accounts or allowing you to search for them. Add an action to un-ban them, un-banning associated accounts at the same time.

On top of that, we can also add a "Ban" button directly on the profile pages.

[Betree]

Some enhancements to make to the "Search & destroy" tool deployed in opencollective/opencollective-frontend#7741:

• Add pagination
• Make the collective name and avatar unclickable, have a dedicated button on the collective page to prevent misclicks (os open in a new tab?)
• Show an editable list of selected accounts somewhere. If you trigger another search, it does not clear selected accounts
• Show more info on the cards
  • Account creation date
  • Number of transactions (already in data)