revert: making secret key configurable and reorganizing settings

[oleobal]

Description

This reverts #688

How has this been tested?

See e2e ⬇️

Checklist

• changelog was updated with notable changes
• documentation was updated

[oleobal]

/e2e --tests sdk,frontend

[oleobal]

/e2e --help

[Owlfred]

Usage: /e2e [options] [help]

/e2e may appear anywhere as long as it is on its own line

Options:
  --refs <value>                                         Extra refs (branch or tag) with format REPO=GIT_REF,REPO=GIT_REF.
  Supported repositories: hlf-k8s, orchestrator, substra-backend, substra-frontend, substra-tools, substrafl, substra, substra-tests, substra-ci.
  Example: /e2e --refs substra-backend=some_branch,orchestrator=some_tag (default: {})
  --tests-to-run, --tests <tests-to-run>                 Comma-separated list of tests to run. Valid options: sdk,substrafl,frontend or NONE. (default: "sdk")
  --benchmarks-to-run, --benchmarks <benchmarks-to-run>  Comma-separated list of workflows tests to run. Valid options: mnist, camelyon or NONE. (default: "NONE")
  --orchestrator-mode, --mode <orchestrator-mode>        Comma-separated list of orchestrator modes to run tests for. Valid options: standalone,distributed (default: "standalone,distributed")
  -h, --help                                             display help for command

[oleobal]

OK, can you try again now you have time on your hands?

/e2e --tests sdk,frontend

[Owlfred]

End to end tests: ✔️ SUCCESS

“Carpe diem. Seize the day, boys.” ― John Keating, Dead Poets Society

[oleobal]

Closed in favour of #676