Add project search to Fund/Collective fields

[hdiniz]

Related opencollective/opencollective#7535

[Betree]

I don't get the need for this account.projects field, which serves the same purpose as account.childrenAccounts but with an ambiguous name. Can't we simply add support for a search term to the existing childrenAccounts field?

{
  collective(slug: "babel") {
    projects: childrenAccounts(accountType: PROJECT, searchTerm: "...") {
      ...
    }
  }
}