Export issue time tracking information

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PM @victorwu

Docs blurb

In 9.0, we introduced the ability to export issues in CSV format. With this release, we are including the time estimate and time spent in the export as well, allowing you more flexibility in work and resource management for those use cases outside of GitLab.

Description

• Add time tracking information to the issue export functionality here: https://gitlab.com/gitlab-org/gitlab-ee/issues/1480.
• Per issue add:
  • Current time estimate. Call the field Time Estimate
  • Current time spent. Call the field Time Spent
  • The format of the two fields should be in seconds, with 5 decimal places in the CSV file.