Zip symlinks-to-directories

[yuxiang-zhang]

Issue #, if available:
Fixes #511
Resolves #69

Description of changes:
This restores partially commit 790cde6, which effectively prevents including symlinks to directories as pointed out in #511.

The function is_parent_directory_in_ignore_list was removed because it was doing a very inefficient M*N lookup (M: number of dirs and files, N: number of entries in ignore_list which include all subdirectories and files). This part was not restored.

Manual testing:
Done with Python 3.9.18 and Python 3.12.10
Set up the following local directories

├── dummy.zip
├── file_a
├── folder_a
│   └── folder_b
│       └── file_b
├── ignore
│   ├── dir
│   │   └── ignored_file
│   └── symlink -> /home/yuxiang/tmp/511/folder_a
└── symlink_to_folder_b -> folder_a/folder_b

6 directories, 4 files

Ran the following code to validate the content of the zip:

import sys, os, io, zipfile

sys.path.append(os.path.abspath('/home/yuxiang/workspace/aws-elastic-beanstalk-cli'))

from ebcli.core import fileoperations

ignore_files = fileoperations.get_ebignore_list()
fileoperations.zip_up_project('dummy.zip', ignore_list=ignore_files)

with zipfile.ZipFile('./dummy.zip', 'r') as zip_ref:
    print(zip_ref.namelist())

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[rahulrajaram]

Awesome. LGTM