Add GraphQL queries for abuse report notes

What does this MR do and why?

• Resolves sub-task 2 of https://gitlab.com/gitlab-org/modelops/anti-abuse/team-tasks/-/issues/168 and follows-up from !132505 (merged)
• Implements the NoteableInterface in GraphQL's AbuseReportType
• It updates the abuse report policy to allow admins to create notes. As part of that it also exposes an abuse report permission type
• In the frontend, it creates the GraphQL queries to create, read, update & delete notes on an abuse report.

How to set up and validate locally

1. Create an abuse report from the rails console. Note down the ID of the report created for step 3.

AbuseReport.create(user: User.last, reporter: User.first, message: "obvious spam")

2. Log-in as an admin and navigate to 127.0.0.1:3000/-/graphql-explorer. Then, try to run the following queries/mutations to create, read, update, delete notes on an abuse report.

3. Create a Note

fragment Author on User {
  id
  avatarUrl
  name
  username
  webUrl
}


fragment AbuseReportNotePermissions on NotePermissions {
  adminNote
}

fragment AbuseReportNote on Note {
  id
  author {
    ...Author
  }
  body
  bodyHtml
  createdAt
  resolved
  userPermissions {
    ...AbuseReportNotePermissions
  }
  discussion {
    id
    notes {
      nodes {
        id
      }
    }
  }
}



mutation createAbuseReportNote($input: CreateNoteInput!) {
  createNote(input: $input) {
    note {
      id
      discussion {
        id
        notes {
          nodes {
            ...AbuseReportNote
          }
        }
      }
    }
    errors
  }
}

# QUERY VARIABLES

{
    "input": {
        "noteableId": "gid://gitlab/AbuseReport/<ID of Abuse Report>",
        "body": "Test Note",
        "discussionId": null,
        "internal": false
    }
}

4. Read a Note

fragment Author on User {
  id
  avatarUrl
  name
  username
  webUrl
}


fragment AbuseReportNotePermissions on NotePermissions {
  adminNote
}

fragment AbuseReportNote on Note {
  id
  author {
    ...Author
  }
  body
  bodyHtml
  createdAt
  resolved
  userPermissions {
    ...AbuseReportNotePermissions
  }
  discussion {
    id
    notes {
      nodes {
        id
      }
    }
  }
}

fragment AbuseReportDiscussionResolvedStatus on Discussion {
  id
  resolvable
  resolved
  resolvedAt
  resolvedBy {
    id
    name
    webUrl
  }
}


query ($id: AbuseReportID!) {
  abuseReport(id: $id) {
    discussions {
    nodes {
      id
      replyId
      ...AbuseReportDiscussionResolvedStatus
      notes {
        nodes {
          ...AbuseReportNote
        }
      }
    }
  }
    labels {
      nodes {
        id
        title
        description
        color
        textColor
      }
    }
  }
}

# QUERY VARIABLES

{
  "id": "gid://gitlab/AbuseReport/<ID of Abuse Report>"
}

5. Update a Note

fragment Author on User {
  id
  avatarUrl
  name
  username
  webUrl
}


fragment AbuseReportNotePermissions on NotePermissions {
  adminNote
}

fragment AbuseReportNote on Note {
  id
  author {
    ...Author
  }
  body
  bodyHtml
  createdAt
  resolved
  userPermissions {
    ...AbuseReportNotePermissions
  }
  discussion {
    id
    notes {
      nodes {
        id
      }
    }
  }
}



mutation updateAbuseReportNote($input: UpdateNoteInput!) {
  updateNote(input: $input) {
    note {
      ...AbuseReportNote
    }
    errors
  }
}

# QUERY VARIABLES

{
    "input": {
        "body": "Updated Note",
        "id": <ID of note from step 3>
    }
}

6. Delete a Note

mutation deleteWorkItemNote($input: DestroyNoteInput!) {
  destroyNote(input: $input) {
    note {
      id
    }
  }
}

# QUERY VARIABLES

{
    "input": {
        "id": <ID of note from step 3>
    }
}