test: improve tox.ini readability by moving forge dependancies to a dedicated file

- forge dependancies are now installed at first, therefore they will not be
  upgraded by the next requirements (no need to upgrade or force installation).
- simply use the zip archive, provided by the forge. No need to install
  hg-evolve.
8 jobs for topic/default/tox_move_dependancies_from_forge_out in 6 minutes and 13 seconds (queued for 29 seconds)
Status Job ID Name Coverage
  Lint
failed lint_doc #30714
allowed to fail

00:06:12

failed lint_doc8 #30713

00:06:13

failed lint_manifest #30712

00:06:13

failed lint_py #30711

00:06:13

 
  Tests
skipped py3-from-forge #30718
allowed to fail
skipped py3_misc #30717
skipped py3_server #30715
skipped py3_web #30716
 
Name Stage Failure
failed
lint_doc Lint There has been a runner system failure, please try again
No job log
failed
lint_doc8 Lint There has been a runner system failure, please try again
No job log
failed
lint_manifest Lint There has been a runner system failure, please try again
No job log
failed
lint_py Lint There has been a runner system failure, please try again
No job log