Add start/end times

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What

Add start/end times to the admin ui/schema

Design

Issue : https://gitlab.com/gitlab-org/gitlab/-/issues/580538

🔗 Figma

Requirements

• Add new columns to the targeted_messages table
• Ensure proper data types and constraints are used
• Ensure proper constraints are in place for data validation
  • starts_at < ends_at
  • starts_at >= now
• Form should be Vue
• respect start/end times in targeted message delivery

Implementation Details

Expand the targeted_messages table. The following columns are examples but you should review the issues in the epic to check for additional columns that will be needed:

starts_at timestamp without time zone NOT NULL,
ends_at timestamp without time zone NOT NULL,