When sparse-checkout is enabled, add the sparse-checkout percentage to
the Trace2 data stream.  This number was already computed and printed
on the console in the "You are in a sparse checkout..." message.  It
would be helpful to log it too for performance monitoring.

Signed-off-by: Jeff Hostetler <jeffhostetler@github.com>

Add VFS checkout hydration percentage information to the default `git
status` output.  When VFS is enable, users will now see a "You are in
a partially-hydrated checkout with <percentage> of tracked files
present." message.

Upstream `git status` normally prints a "You are in a sparse checkout
with <percentage> of tracked files present."  This message was hidden
in `microsoft/git` when `core_virtualfilesystem` is set (because GVFS
users are always (and secretly) in a sparse checkout) and it was
thought that it would annoy users.

However, we now believe that it may be helpful for users to always see
the percentage and know when they are over-hyrdated, since
over-hyrdation can occur by accident and may greatly impact their Git
performance.  Knowing this value may help with GVFS support.

Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Jeff Hostetler <jeffhostetler@github.com>

Target `macos-11` is deprecated now and is in scheduled brownouts.
Update to `macos-13`.

Signed-off-by: Jeff Hostetler <jeffhostetler@github.com>