tor-proto/tor-circmgr: remove "ntor_v3" feature flag (and always enable)

My understanding is that ntor v3 can be always-enabled now, and we'll need this for congestion control, so I've removed the "ntor_v3" feature from tor-proto and tor-cirgmr. It seems best to do this right after a new release so that this has more time to sit as stable behaviour before the next release.

Note: Don't merge until after the release when the main branch is unfrozen. Edit: Marking as "draft" just to prevent merges.

/cc @dgoulet, @nickm, @jnewsome

requested review from @opara

assigned to @opara

+1 to always enabling ntor-v3.

added 3 commits

• f6ee1f11 - tor-circmgr: removed "ntor_v3" feature flag
• 7f484644 - tor-proto: clean up after "ntor_v3" feature flag removal
• 718e4917 - tor-circmgr: clean up after "ntor_v3" feature flag removal

Compare with previous version

changed the description

removed review request for @opara

changed the description

requested review from @Diziet

marked this merge request as draft

changed the description

approved this merge request

marked this merge request as ready

added 23 commits

• 718e4917...8f85ef29 - 19 commits from branch tpo/core:main
• a4c610b6 - tor-proto: removed "ntor_v3" feature flag
• c8fac431 - tor-circmgr: removed "ntor_v3" feature flag
• 7879ef66 - tor-proto: clean up after "ntor_v3" feature flag removal
• 4057344e - tor-circmgr: clean up after "ntor_v3" feature flag removal

Compare with previous version

Had to rebase due to a merge conflict. The only conflict was in tests/shadow/README.md.

enabled an automatic merge when all merge checks for 4057344e pass

mentioned in commit ce7c7325

merged

mentioned in issue #1084 (closed)