Merge feature-arch-v2 into main

[pierrehilbert]

Having v2 control protocol progress merged into main branch.
First step will be to merge main into feature-arch-v2 to ensure that the current delta won't break anything.

Tasks:

• Merge main branch into feature-arch-v2
• Testing to validate that everything is still working
• Merge feature-arch-v2 branch into main October 26 at 9am PDT
• Communicate to other teams that they can merge their PR

[blakerouse]

#1557 is the PR that completes the first task (with hopes another does not need to be performed before Oct. 26)

[cmacknz]

Related, we need to do the same thing for fleet-server: elastic/fleet-server#2060

[blakerouse]

#1694 performs another merge.