Mutation for updating compliance requirement

What does this MR do and why?

Adding a mutation for updating a compliance requirement for a compliance framework.

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

How to set up and validate locally

1. You must have a group with GitLab Ultimate license for testing this.
2. Make sure the group has at least one compliance framework associated with it. If not then you can follow steps mentioned here for creating one.
3. Create requirement using graphql

mutation createComplianceRequirement {
  createComplianceRequirement(
    input: {
      complianceFrameworkId: "gid://gitlab/ComplianceManagement::Framework/<id>",
      params: {
        name: "Custom req 2",
        description: "some description"
        controlExpression: "{\"operator\":\"=\",\"field\":\"minimum_approvals_required\",\"value\":2}"
    
      }
    }) {
    errors
    requirement {
      id
      name
      description
      controlExpression
    }
  }
}

4. update requirement

mutation updateComplianceRequirement {
  updateComplianceRequirement(
    input: {
      id: "gid://gitlab/ComplianceManagement::ComplianceFramework::ComplianceRequirement/<id>",
      params: {
        name: "Updated name",
        description: "Updated description"
        controlExpression: "{\"operator\":\"=\",\"field\":\"minimum_approvals_required\",\"value\":4}"
      }
    }) {
    errors
    requirement {
      id
      name
      description
      controlExpression
    }
  }
}

Related to #470695 (closed)