Migrate to latest angular features

[eneajaho]

• partial hydration
• new ssr
• signals
• zoneless

[ChristopherPHolder]

We currently have 2 MR in suspense to migrate to v18 and well i guess we will basically go straight to v19...

• chore: upgrade to v18 #285
• Upgrade to v18 #286

From what I see the issue to get that merge is the setup for SSR and Firebase.

It seems to me we currently do not have any SSR deployed?

Should we not migrate to the new application builder and remove the ng-universal-express project?
And ether also remove the firebase-function project or excluded from the test to that we can keep moving forward on this?

@eneajaho @hoebbelsB @BioPhoton