agent: Add is_not_shortcut_filter()

Adds a filter that can be used with filter_files() to return only files
that are not Windows shortcuts.

monkey/infection_monkey/utils/dir_utils.py

@@ -23,3 +23,7 @@ def file_extension_filter(file_extensions: Set):
 
 def is_not_symlink_filter(f: Path):
     return not f.is_symlink()
+
+
+def is_not_shortcut_filter(f: Path):
+    return f.suffix != ".lnk"

monkey/tests/unit_tests/infection_monkey/utils/test_dir_utils.py

@@ -7,10 +7,12 @@ from infection_monkey.utils.dir_utils import (
     file_extension_filter,
     filter_files,
     get_all_regular_files_in_directory,
+    is_not_shortcut_filter,
     is_not_symlink_filter,
 )
 
-FILES = ["file.jpg.zip", "file.xyz", "1.tar", "2.tgz", "2.png", "2.mpg"]
+SHORTCUT = "shortcut.lnk"
+FILES = ["file.jpg.zip", "file.xyz", "1.tar", "2.tgz", "2.png", "2.mpg", SHORTCUT]
 SUBDIRS = ["subdir1", "subdir2"]
 
 
@@ -113,3 +115,13 @@ def test_is_not_symlink_filter(tmp_path):
     assert link_path in files_in_dir
     assert len(filtered_files) == len(FILES)
     assert link_path not in filtered_files
+
+
+def test_is_not_shortcut_filter(tmp_path):
+    add_files_to_dir(tmp_path)
+
+    files_in_dir = get_all_regular_files_in_directory(tmp_path)
+    filtered_files = filter_files(files_in_dir, [is_not_shortcut_filter])
+
+    assert len(filtered_files) == len(FILES) - 1
+    assert SHORTCUT not in [f.name for f in filtered_files]