Improve exported lists ZIP filename for better clarity

[zackcl]

Currently, exporting all lists from the Lists table produces a file named Lists.zip when multiple lists exist.

This filename provides no context about what the file contains and makes it hard to distinguish between different exports.

I suggest including the following information in the filename:

• the Experiment / Feature Flag / Segment name
• the list type (include or exclude), when applicable
• the current date

Examples

Experiment / Feature Flag:

• ProjectName_Include_Lists_2026-01-27.zip
• ProjectName_Exclude_Lists_2026-01-27.zip

Segment:

• SegmentName_Lists_2026-01-27.zip