Protected packages: Add minimum_access_level_for_delete to GRAPHQL API

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What does this MR do and why?

Protected packages: Add minimum_access_level_for_delete to GRAPHQL API

The attribute minimum_access_level_for_delete that was introduced in the MR: !179739 (merged) .

This commit includes the attribute minimum_access_level_for_delete in the GRAPHQL API and also updates the documentation.

This MR is also relevant for integrating the GraphQL field minimumAccessLevelForDelete also in the frontend, see follow-up MR Protected packages: Add minimumAccessLevelForDe... (!180416 - merged).

Changelog: added

🛠️ with ❤️ at Siemens

References

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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.

MR Checklist (@gerardo-navarro)

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the style guides
• Conforms to the javascript style guides
• Conforms to the database guides
• Conforms to the merge request performance guidelines
• Wait for Protected packages: Add basics for package dele... (!179739 - merged)

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Checkout the branch and start the rails server
2. Play around with the GraphQL explorer: http://gdk.test:3000/-/graphql-explorer
3. Execute a mutation for creating the package protection rule

mutation {
  createPackagesProtectionRule(input: {
    projectPath: "flightjs/Flight"
    packageNamePattern: "@my-new-scope/my-package-2-*"
    packageType: NPM
  	minimumAccessLevelForPush: MAINTAINER
    minimumAccessLevelForDelete: OWNER
  }) {
    packageProtectionRule {
      id
      packageNamePattern
      packageType
      minimumAccessLevelForPush
      minimumAccessLevelForDelete
    }
    errors
  }
}

4. Update only the field minimumAccessLevelForDelete of the newly created package protection rule

mutation {
  updatePackagesProtectionRule(
    input: {
      id: "{{lastCreatedProtectionRuleId}}"
      minimumAccessLevelForDelete: null
    }
  ){
    packageProtectionRule {
      id
      packageNamePattern
      packageType
      minimumAccessLevelForPush
      minimumAccessLevelForDelete
    }
    errors
  }
}

Related to #416381 (closed)