includeIf not matching during `git rebase`

["Michał Mirosław" <emmir@google.com>]

* What did you do before the bug happened? (Steps to reproduce your issue)

With ~/.gitconfig having:

[includeIf "onbranch:pr/"]
        path = .gitconfig.for-upstream

where the included config changes commit-msg hook,

git checkout pr/zzz # has multiple commits over upstream
git rebase -i
> 'edit' first commit
(modify it)
git rebase --continue

* What did you expect to happen? (Expected behavior)

The commit messages are unchanged.

* What happened instead? (Actual behavior)

The rebased commits had messages modified by default commit-msg hook.

* What's different between what you expected and what actually happened?

I'd expect includeIf to match and in effect prevent the default commit
message modifications.

[System Info]
git version:
git version 2.41.0.487.g6d72f3e995-goog
cpu: x86_64
no commit associated with this build
sizeof-long: 8
sizeof-size_t: 8
shell-path: /bin/sh
compiler info: gnuc: 12.2
libc info: glibc: 2.36
$SHELL (typically, interactive shell): /bin/bash


[Enabled Hooks]
commit-msg
pre-commit
prepare-commit-msg