Remove Jedi 0.17 and ancillary projects

[kimadeline]

Follow-up to #11995

Also remember to:

• Remove all experiment code added to support jedi and jediLSP (including unifying behind the Jedi language server setting option and doing the right thing for Python 2)
• Clean up old issues
  • Jedi
  • ctags
  • Rope
  • Pylint-related issues to default filter

[kimadeline]

PRs:

• Replace Jedi with Jedi LSP #17273
• Display a notification when using JediLSP with Python 2.7 #17407
• Delete Jedi-related files #17427
• Delete Jedi-related settings, and update default Pylint settings #17428
• Remove old code #16877
• Jedi behind LSP reqs in main reqs files #17446