DAST Site validation - Add project.dastSiteValidation query - Backend

• overview: &2912 (closed)
• parent issue: #233020 (closed)
• context

Summary

this issue outlines the a new graphql mutation that's required. please see the parent issue for the proposed api contract.

query project($fullPath: ID!, $targetUrl: String!) {
  project(fullPath: $fullPath) {
    dastSiteValidation(targetUrl: $targetUrl) {
      id
      status
    }
  }
}

Implementation Plan

• create project.dastSiteValidation query