Should we extract `StashUnstagedChanges#initial_commit?` to a module or make it public?

[Quintasan]

~/overcommit/lib/overcommit/hook/pre_commit/execute_permissions.rb:29: warning: Overcommit::Hook::PreCommit::Base#initial_commit? at ~/.rbenv/versions
/2.6.5/lib/ruby/2.6.0/forwardable.rb:158 forwarding to private method Overcommit::HookContext::PreCommit#initial_commit?

Originally posted by @sds in #727 (comment)

[Quintasan]

@sds We can either:

1. Make StashUnstashedChanges#initial_commit? public.
2. Extract it into it's own module and include it where needed.

As you are the maintainer I'm going to defer to your call on this but my personal opinion is that we should extract it to a module on it's own as it's not exclusively related to stashing and unstashing changes.

[Quintasan]

@sds I went with the smallest change possible seeing as you didn't respond. We can always extract this particular function to a module later on if really necessary.

[sds]

Sorry I missed your suggestion, @Quintasan. Fine with the current approach. Thank you.