Rename venue Contact Information to Contact Email Address

[dd32]

Summary

• Renames the venue "Contact Information" field label to "Contact Email Address" in the admin UI, while preserving the existing Contact Information meta key for backward compatibility with stored data.
• Makes this field mandatory before status can change to "Scheduled" for Campus Connect events, ensuring a specific point of contact is collected for each campus.
• Adds a $labels parameter to display_meta_boxes() so field display names can differ from stored meta keys.

Fixes WordPress#1598

Test plan

• Open a Campus Connect event in the admin and verify the venue section shows "Contact Email Address" instead of "Contact Information"
• Verify that trying to change a Campus Connect event status to "Scheduled" without filling in the Contact Email Address field shows a validation error
• Verify that non-Campus Connect events (WordCamp, Meetup) do not require the Contact Email Address field for Scheduled status
• Verify that existing data saved under the "Contact Information" meta key still loads correctly in the renamed field

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