Add immediate email for promotions

[michaeljguarino]

Summary

Also enable the digest cron written a while ago but never wired up

Test Plan

unit

Checklist

• [ ] If required, I have updated the Plural documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] I have added a meaningful title and summary to convey the impact of this PR to a user.
• [ ] I have added relevant labels to this PR to help with categorization for release notes.

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Static Hosting

Name	Link	Commit	Status
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rtc-coverage	Visit	e6099625b46041c5c7aa429e954defdb00cd803f	✅
core-coverage	Visit	e6099625b46041c5c7aa429e954defdb00cd803f	✅
cron-coverage	Visit	e6099625b46041c5c7aa429e954defdb00cd803f	✅
email-coverage	Visit	e6099625b46041c5c7aa429e954defdb00cd803f	✅
worker-coverage	Visit	e6099625b46041c5c7aa429e954defdb00cd803f	✅
api-test-results	Visit	e6099625b46041c5c7aa429e954defdb00cd803f	✅
graphql-coverage	Visit	e6099625b46041c5c7aa429e954defdb00cd803f	✅
rtc-test-results	Visit	e6099625b46041c5c7aa429e954defdb00cd803f	✅
core-test-results	Visit	e6099625b46041c5c7aa429e954defdb00cd803f	✅
cron-test-results	Visit	e6099625b46041c5c7aa429e954defdb00cd803f	✅
email-test-results	Visit	e6099625b46041c5c7aa429e954defdb00cd803f	✅
worker-test-results	Visit	e6099625b46041c5c7aa429e954defdb00cd803f	✅
graphql-test-results	Visit	e6099625b46041c5c7aa429e954defdb00cd803f	✅

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