exp save: Incorrect warnings about untracked files

[daavoo]

The current check:

dvc/dvc/repo/experiments/save.py

Lines 61 to 62 in 6fbbbec

	if include_untracked:
	untracked = [file for file in untracked if file not in include_untracked]

Logs warnings when there is not an exact string match between the untracked in scm.status() and any item in include_untracked.

This causes incorrect warnings in scenarios like passing a folder to --include-untracked:

$ git init
$ dvc init
$ git commit -m "init"
$ mkdir data
$ touch data/foo
$ touch data/bar
$ dvc exp save --include-untracked data
WARNING: The following untracked files were present in the workspace before saving but will not be included in the experiment commit:
	data/foo, data/bar
Experiment has been saved as: paler-tams                              

To promote an experiment to a Git branch run:

	dvc exp branch <exp> <branch>

Where data/foo and data/bar are actually included in the experiment:

$ git show f312d6d
commit f312d6d00ab0ff7d6bb1d2d0fb8eca12e2a8ffb0 (refs/exps/2e/95a6fc1d0347b35f21d03051555f55bd4cf2af/paler-tams)
Author: David de la Iglesia Castro <daviddelaiglesiacastro@gmail.com>
Date:   Mon Feb 20 15:15:31 2023 +0100

    dvc: commit experiment paler-tams

diff --git a/data/bar b/data/bar
new file mode 100644
index 0000000..e69de29
diff --git a/data/foo b/data/foo
new file mode 100644
index 0000000..e69de29