Add mutation for attaching and detaching attributes to and from project

What does this MR do and why?

Add a mutation for attaching and detaching attributes to and from project

Changelog: added
EE: true

How to set up and validate locally

1. Enable security_categories_and_attributes feature flag:
   Feature.enable(: security_categories_and_attributes)
2. Use this query to attach the predefiend attributes (and create default categories on the fly):

   mutation test {
     securityAttributeProjectUpdate(input:{
       projectId: "gid://gitlab/Project/<PROJECT_ID>",
       attributeTemplateTypes: [MISSION_CRITICAL]
     }){
       addedCount
       removedCount
     }
   }

3. Use the queries in this MR to create more categories and attributes.
4. Use this query to get other existingc ategories and attributes:

   query categories($fullPath: ID!) {
      group(fullPath: $fullPath) {
        id,
        securityCategories{
          name
          description
          editableState
          id
          multipleSelection
          templateType
          securityAttributes{
            name
            color
            description
            editableState
            id
          }
        }
      }
    }

5. Use this query to add and remove attributes to a project by id:

   mutation test {
     securityAttributeProjectUpdate(input:{
       projectId: "gid://gitlab/Project/<PROJECT_ID>",
       addAttributeIds: ["gid://gitlab/Security::Attribute/<ATTRIBUTE_ID>"],
       removeAttributeIds: ["gid://gitlab/Security::Attribute/<ATTRIBUTE_ID>"]
       
     }){
       addedCount
       removedCount
     }
   }

6. Repeat the previous step with multiple selection category and multiple matching attributes.

MR acceptance checklist

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

Related to Add attribute attach and detach mutations (#567231 - closed) • Gal Katz • 18.5