Added sorting option to timelogs GraphQL resolver

What does this MR do and why?

This MR adds a sort argument to the timelogs' GraphQL resolver so to allow sorting 🙂

Screenshots or screen recordings

How to set up and validate locally

1. Log some time entries to issues or MRs using the /spent quick action (alternatively you could create those from the rails console)
2. Run a this GraphQL query changing the sort value and check that the timelogs are sorted accordingly 🙂

query {
  timelogs(sort: SPENT_AT_ASC) {
    nodes {
      timeSpent
      spentAt
    }
  }
}

MR acceptance checklist

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