Add bisect menu entry that lets you choose bisect terms

This can be useful if you want to find the commit that fixed a bug (you'd use
"broken/fixed" instead of "good/bad" in this case), or if you want to find the
commit that brought a big performance improvement (use "slow/fast"). It's pretty
mind-bending to have to use "good/bad" in these cases, and swap their meanings
in your head.

Thankfully, lazygit already had support for using custom terms during the bisect
(for the case that a bisect was started on the command-line, I suppose), so all
that's needed is adding a way to specify them in lazygit.

pkg/integration/tests/test_list.go

@@ -30,6 +30,7 @@ import (
 
 var tests = []*components.IntegrationTest{
 	bisect.Basic,
+	bisect.ChooseTerms,
 	bisect.FromOtherBranch,
 	branch.CheckoutByName,
 	branch.CreateTag,