Create GraphQL mutation to create an Organization

What does this MR do and why?

Related issue: #417891 (closed)

Create GraphQL mutation to create an Organization

Screenshots or screen recordings

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How to set up and validate locally

1. Run the following mutation: http://127.0.0.1:3000/-/graphql-explorer

mutation {
  organizationCreate(input: {name: "test", path: "test"}) {
    organization{
      name
    }
  }
}

You should see a new organization created

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.