Donation API endpoint should accept end date without start date

[pulsovi]

User Story

As a web integrator, I want to request Give API for oldest donations by using "end" request param so that returns the "end parameter invalid" error.

Details

When requesting wp-json/give-api/v2/admin/donations with end parameter but without start parameter, the request is rejected because "end parameter invalid".

Expected Behavior

When start is missing, end should not be tested to be after start.

Steps to Reproduce

1. Request wp-json/give-api/v2/admin/donations?end=2023-12-31

Acceptance Criteria

• Requesting wp-json/give-api/v2/admin/donations?end=2100-12-31 (very far away date) should return the same result as requesting without end parameter.

[github-actions]

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