From: Anh Le <anh@canva.com>

In a large repository using sparse checkout, checking
whether a file marked with skip worktree is present
on disk and its skip worktree bit should be cleared
can take a considerable amount of time. Add a trace2
region to surface this information.

Signed-off-by: Anh Le <anh@canva.com>

Submitted-As: https://lore.kernel.org/git/pull.1368.git.git.1666742722502.gitgitgadget@gmail.com