Simplify `cmd/zetae2e/local/` and remove most runner file

[lumtis]

Describe the Issue

• We currently have one file per each e2e test runner while most share the same logic. We can remove most of these files and keep a single runner initializer (it is currently the case for v2 test where all v2 runners use v2.go)

• local.go can be simplified and reorganized. Most of the logic is in localE2ETest function, we could have subfunction for the different type of test to use and switch/case statement to make the lgoic more visual.