Add mutation to edit approval rules

What does this MR do and why?

Add mutation to edit approval rules

Requires:

• id which is a GlobalID
• name
• approvals_required
• user_ids
• group_ids

Returns:

• approval_rule which is an instance of ApprovalProjectRule

Closes #441289 (closed)

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Before	After

How to set up and validate locally

In the graphql explorer:

Replace id with an approval project rule ID for your GDK using the following

---

query {
  project(fullPath: "Flightjs/flight") {
    branchRules {
      nodes {
        approvalRules {
          nodes {
            id
          }
        }
      }
    }
  }
}

If you can't find one with the previous snippet you can generate your own by following this format

gid://gitlab/ApprovalProjectRule/#{approval_project_rule_id}

---

You may also want to replace the user and group ids. User 1 should be the root user which is admin so I believe they would have access to the project already but you may want to invite them.

Group 1 may also need to be invited to the project or alternatively create a new group and invite them to the project. Invite members to that group and they should be added to the approval rule.

mutation {
  approvalProjectRuleUpdate(input:{ id: "gid://gitlab/ApprovalProjectRule/4", name: "New Name", approvalsRequired: 4, userIds: [1], groupIds: [1]}) {
    approvalRule {
      id
      name
      type
      approvalsRequired
      eligibleApprovers {
        nodes {
          id
          username
          email
        }
      }
    }
  }
}