Migrate from Akka to Pekko

[DanielCliftonGuardian]

What is the value of this and can you measure success?

Replaces explicit uses of Akka with Pekko equivalent. To bring us in line with licensing requirements and allow us to continue receiving security patches.

I have left akka.stream.Materializer as from the doc seems like we might be able to continue using these

What does this change?

Resolves guardian/dotcom-rendering#8783

Checklist

• Tested locally, and on CODE if necessary
• Will not break dotcom-rendering
• Will not break our database – if updating CAPI, updated and committed the database files
• Meets our accessibility standards
  • Tested with screen reader
  • Navigable with keyboard
  • Colour contrast passed

[cemms1]

This is looking really good! 🚀

I think we're still missing a few uses of the old Akka system though (running dev-build on this branch locally highlights an old usage, for instance)

[cemms1]

We aren't totally consistent with naming the ActorSystem across the repo, so it might be better to reference it in the same way everywhere for better readability.

Not blocking though. If this works on CODE and locally then go for it 🚀

[prout-bot]

Seen on ADMIN-PROD (merged by @DanielCliftonGuardian 18 minutes and 8 seconds ago)

• Check your changes on www.theguardian.com ✔️
• Keep an eye on the deploy dashboard 📉

[prout-bot]

Seen on FRONTS-PROD (merged by @DanielCliftonGuardian 20 minutes and 24 seconds ago)

• Check your changes on www.theguardian.com ✔️
• Keep an eye on the deploy dashboard 📉

[mkurz]

See

• Switch to Play 3 and go all in on Pekko #26677

for migrating to Play 3 which comes with Pekko now.