Configurable Map Zip Provider Lookback

[AlexCatarino]

Description

Adds config map-file-zip-lookback-days to increase the hard-coded default of 30 days.

Related Issue

N/A.

Motivation and Context

We need it for the Docs CI.

Requires Documentation Change

No.

How Has This Been Tested?

Running LEAN locally. The behavior doesn't change. If we add the key to 300, I find a Zip file from Aug 2025 I've downloaded in Aug.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Refactor (non-breaking change which improves implementation)
• Performance (non-breaking change which improves performance. Please add associated performance test and results)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Non-functional change (xml comments/documentation/etc)

Checklist:

• My code follows the code style of this project.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My branch follows the naming convention bug-<issue#>-<description> or feature-<issue#>-<description>

[jaredbroad]

Please change to a fixed/specific look up date, not a rolling backward look back days.