Add export path for group related dependency list

What does this MR do and why?

This is a follow-up from !123397 (merged)

Add dependency list export path for group level dependencies.

Related issue: #408855 (closed)

How to set up and validate locally

1. Fetch this branch add_export_path_for_groups_dependency_list
2. Turn on the feature flag to make Dependency list appear in groups:

echo "Feature.enable(:group_level_dependencies)" | rails c

3. Go to group level dependency endpoint of any group as in the following example: http://gdk.test:3000/groups/top-level-group/-/dependencies
4. Search for data-export-endpoint on the elements tab and it will be set to a value similar to the following: /api/v4/groups/88/dependency_list_exports

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.