1. Fix Default Filtering in ProjectFilterSet:
   - Modified the `ProjectFilterSet` to include `is_marked_for_deletion` in the default filtering when `is_archived` is not provided.
   - This ensures that projects marked for deletion are excluded from default views.

2. Migration for `is_marked_for_deletion`:
   - Added a migration (`0052_project_is_marked_for_deletion.py`) to introduce the `is_marked_for_deletion` field in the `Project` model.

3. Updated `Project` Model:
   - Added `is_marked_for_deletion` field to the `Project` model with a default value of `False`.

4. Modified `ProjectListView` to Exclude Marked Projects:
   - Modified the `get_queryset` method in `ProjectListView` to only fetch projects with `is_marked_for_deletion=False`.

5. Introduced `mark_for_deletion` Method:
   - Added a `mark_for_deletion` method in the `Project` model to set the `is_marked_for_deletion` flag and save the model.

6. Changed `delete` Method in `Project` Model:
   - Renamed the `delete` method to `delete_action` in the `Project` model to avoid conflicts.
   - Introduced a new `delete` method that marks the project for deletion and enqueues a background deletion task.

7. Background Deletion Task:
   - Created a background deletion task using `django_rq` to handle project deletion asynchronously.
   - Checks if the project is still marked for deletion before proceeding.
   - If an error occurs during deletion, updates project status and logs an error.

8. Updated `ProjectActionView` Success Message:
   - Modified the success message in `ProjectActionView` for the "delete" action to provide a more informative message based on the count.

Fixes: nexB#1002
Signed-off-by: Jayanth Kumar <jknani111@gmail.com>

1. Fix Default Filtering in ProjectFilterSet:
   - Modified the `ProjectFilterSet` to include `is_marked_for_deletion` in the default filtering when `is_archived` is not provided.
   - This ensures that projects marked for deletion are excluded from default views.

2. Migration for `is_marked_for_deletion`:
   - Added a migration (`0052_project_is_marked_for_deletion.py`) to introduce the `is_marked_for_deletion` field in the `Project` model.

3. Updated `Project` Model:
   - Added `is_marked_for_deletion` field to the `Project` model with a default value of `False`.

4. Modified `ProjectListView` to Exclude Marked Projects:
   - Modified the `get_queryset` method in `ProjectListView` to only fetch projects with `is_marked_for_deletion=False`.

5. Introduced `mark_for_deletion` Method:
   - Added a `mark_for_deletion` method in the `Project` model to set the `is_marked_for_deletion` flag and save the model.

6. Add `delete_in_background` Method in `Project` Model:
   - Introduced a new `delete_in_background` method that marks the project for deletion and enqueues a background deletion task.

7. Background Deletion Task:
   - Created a background deletion task using `django_rq` to handle project deletion asynchronously.
   - Checks if the project is still marked for deletion before proceeding.
   - If an error occurs during deletion, updates project status and logs an error.

8. Updated `ProjectActionView` Success Message:
   - Modified the success message in `ProjectActionView` for the "delete" action to provide a more informative message based on the count.

Fixes: nexB#1002
Signed-off-by: Jayanth Kumar <jknani111@gmail.com>