Specifically, functions that are run in the context of the test runner
are put in module `test/testutil.lua` while the functions that are run
in the context of the test session are put in
`test/functional/testnvim.lua`.
Closes https://github.com/neovim/neovim/issues/27004.
feat(eval): add reg_recorded()
This function is used the get the last recorded register.
style(Recording): rename handler to match suggestions
fix(RecordingLeave): send autocommand earlier
This makes the autocommand fire just before setting reg_recorded to
reg_recording, this way we clearly show that we are actually just before
actually quitting the recording mode.