Add min_access_level argument to Projects GraphQL query

What does this MR do and why?

Needed for &13066 where we are moving Your work -> Projects to Vue and fetching the data with GraphQL. We need to provide a Role filter in the UI so we are adding a min_access_level argument to the Projects GraphQL query.

MR acceptance checklist

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How to set up and validate locally

1. Go to http://gdk.test:3000/-/graphql-explorer
2. Run the following

query getProjects {
  projects(membership: true, minAccessLevel: OWNER) {
    nodes {
      nameWithNamespace
      maxAccessLevel {
        humanAccess
      }
    }
  }
}