Add attribute create and update mutations

What does this MR do and why?

Add attribute create and update mutations

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 GraphQL to create categories:

    mutation verify {
      securityCategoryCreate(input: {
        namespaceId: "gid://gitlab/Group/<GROUP_ID>",
        name:"This is a test",
        description:"This is a desc",
        multipleSelection: true,
      }){
        securityCategory {
          id
          name
          description
        },
        errors
      }
    }

3. Use this GraphQL query to create attributes for the created category:

    mutation CreateSecurityAttributes {
      securityAttributeCreate(input: {
        categoryId: "gid://gitlab/Security::Category/<CATEGORY_ID>",
        attributes: [
          {     
            name: "Name",
     	      description: "Description",
            color: "#FFFFFF"
          },
          {     
            name: "Another Name",
     	      description: "Another Description",
            color: "#FFFFFF"
          }  
        ]
      }) {
        securityAttributes {
          id
          name
          description
          color
          editableState
          securityCategory {
            id
            name
          }
        }
        errors
      }
    }

4. Use this mutation to update an attribute:

    mutation UpdateSecurityAttribute {
      securityAttributeUpdate(input: {
        id: "gid://gitlab/Security::Attribute/<ATTRIBUTE_ID>",
        name: "New Name",
        description: "New Description",
        color: "#8B0000"
      }) {
        securityAttribute {
          id
          name
          description
          color
          editableState
          securityCategory {
            id
            name
          }
        }
        errors
      }
    }

MR acceptance checklist

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Related to Add attributes mutations (#564817 - closed) • Gal Katz • 18.5