E2E refactoring

[farazdagi]

What type of PR is this?

Other / Refacotring

What does this PR do? Why is it needed?

• https://hackmd.io/5fyu7R3zRnm8NeppiY_sRg?view
• This PR will be sliced into several parts for easier review:
  • Introduce ComponentRunner E2E refactoring: bootnode #8659
  • Switch to refactored component runner
    • BootNode E2E refactoring: bootnode #8659
    • BeaconNode E2E refactoring: BeaconNode and BeaconNodeSet #8667
    • ValidatorNode E2E refactoring: ValidatorNode and ValidatorNodes #8665
    • ETH1Node E2E refactoring: ETH1 Node #8663
    • SlasherNode E2E refactoring: SlasherNodeSet and SlasherNode #8672
  • This PR
    • Refactors endtoend_test.go file, by testRunner struct, extracting methods from the run function that does too much (it still does, but in somewhat more organized way), use all the node types that have been previously merged.
    • Removes deprecated code: this PR really switches to the new process creation/status/termination routine using errgroup

Which issues(s) does this PR fix?

N/A

Other notes for review

• Once this PR merges, we will have correct node process management (with proper cleanup after each test), so it will be possible to merge e2e connectivity fix (in Add connectivity E2E test #8607, which is done, but since running multiple tests on a single shard was impossible, that PR fails e2e test, the problem will not exist after refactored test runner is used)
• It is probably easier to review the PR by checking it in, and reviewing endtoend_test.go file locally.

[codecov]

Codecov Report

Merging #8643 (20c49cb) into develop (e32c88e) will decrease coverage by 0.02%.
The diff coverage is n/a.

❗ Current head 20c49cb differs from pull request most recent head 46d7af8. Consider uploading reports for the commit 46d7af8 to get more accurate results

@@             Coverage Diff             @@
##           develop    #8643      +/-   ##
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- Coverage    61.24%   61.22%   -0.03%     
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  Files          494      494              
  Lines        34343    34343              
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- Hits         21035    21028       -7     
- Misses       10171    10178       +7     
  Partials      3137     3137