Adjust digest based on last_email_clicked logic

[benhalpern]

What type of PR is this? (check all applicable)

• [ ] Refactor
• [x] Feature
• [ ] Bug Fix
• [ ] Optimization
• [ ] Documentation Update

Description

Now that we are looking back one day + 12 hours, it's possible to get the same first article two days in a row. This accounts for that.

We are also going to now mark should_receive_email? as true if the last email has been clicked. This helps keep up the streak for openers, and removes any "off by one" problems we currently face.

Related Tickets & Documents

• Related Issue https://github.com/forem/forem/issues/20755

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