Merge this branch to help fix build issues.

[burtonator]

This does not fix a specific ticket.... it's like 80% of what we need to fix the ticket and then I have to go back and verify it's 100% completed. See the comments from @timolegros below.

OK. Here's the deal.

I found a bug with the way we're migrating to strict null checks that was hiding 19 compilation errors.

I have a PR here:

#9021

which identifies them.

I was able to fix like five.

I've removed the @ts-expect-error from the files that need to be repaired so this build will have like 10-20 compilation errors.

We just have to fix these... then we're good to go.

[timolegros]

@burtonator both errors in delete_community.ts and both errors in update_community_id.ts should be resolved in #9068. A couple of other ones related to notifications have also been resolved on master since the recent notification removal PRs. We will only be left with a handful.

Lets:

1. Merge Remove all legacy notification/subscription models #9068 and Random compilation fixes.  #9020
2. Review remaining errors and create tickets + assign appropriately otherwise this PR will forever remain in an "I thought he was handling that error" situation.