Improve missing options error message in GPT data generator

Nailia Iskhakovarequested to merge
424-print-missing-options-in-generator into master

The MR adds some minor tweaks:

  • Calling out missing options in error message to be clearer in GPT Data Generator
  • Adds time stamp output before starting large import test
  • Tweak api_v4_projects_repository_compare.js threshold as it failed today on 2k env
  • Increase web_project_files.js TTFB threshold as it intermittently fails for the last 2 weeks on 1k and 2k envs.

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