[Bug-vc-dwim] bug#69464: Test failures

[Collin Funk]

Hello, I discovered an issue in gnulib that also affects vc-dwim. My 
~/.gitconfig file changed the output of `git log' which caused some issues. 
Here is a link to the discussion:

https://lists.gnu.org/archive/html/bug-gnulib/2024-02/msg00270.html

This patch fixes a test failure that does not take into account my 
configuration:

Author:     Jim Meyering <meyering@meta.com>
AuthorDate: Tue Feb 27 19:13:14 2024 -0800
Commit:     Jim Meyering <meyering@meta.com>
CommitDate: Tue Feb 27 19:13:14 2024 -0800

But the grep call expects one space which is okay if we assume default options:

Author: Jim Meyering <meyering@meta.com>
Date:   Tue Feb 27 19:13:14 2024 -0800

Adding the --format=medium changes the git log to format like this even if the 
user has different settings in their ~/.gitconfig.

The ignore-dirty-submodules test fails with ERROR. I'll look into it in a bit 
but I'm not too familiar with git submodules. I've attached the log for that 
too.

Collin

0001-tests-Make-git-log-more-robust-against-user-configur.patch
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ignore-dirty-submodules.log
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