Add whats new id deletion logic

[LizBaker]

We have a script to generate new whats new IDs, but it didn't include any cleanup for what's new posts that get deleted.
the nr1-announcements end-point doesn't care about this because it only matches IDs to existing posts, but the nr1-announcements/ids endpoint grabs the entire ID list which includes the deleted posts. this is was causing issue in the whats new nerdlet since they rely on the /ids endpoint to know when to delete a post

[github-actions]

Hi @LizBaker 👋
Thanks for your pull request! Your PR is in a queue, and a writer will take a look soon. We generally publish small edits within one business day, and larger edits within three days.

[gatsby-cloud]

Gatsby Cloud Build Report

docs-website-develop

🎉 Your build was successful! See the Deploy preview here.

Build Details

View the build logs here.

🕐 Build time: 11m

[roadlittledawn]

should the number of ID entries in ids.json be equal to the number of posts in nr1-announcements.json ?

i see 104 IDs and 101 posts.

[LizBaker]

@roadlittledawn yes! but i figured i'd let the action run the new script and commit the changes when it does rather than myself committing them. i guess there's no difference really, should i also commit the updated whats new file?

[roadlittledawn]

ah right because that runs later and commits to develop.

if it doesn't cause a mismatch between main and develop, sure. but maybe it's best to leave it run. though i just noticed last couple runs failed? https://github.com/newrelic/docs-website/actions/workflows/update-whats-new-ids.yml

[LizBaker]

hmm interesting, looks like one was a bad install and the other was out of sync, though i'm confused about how it got that way