Add Electra fork boilerplate (#5122)

* Add Electra fork boilerplate

* Remove electra from spec tests

* Fix tests

* Remove sneaky log file

* Fix more tests

* Fix even more tests and add suggestions

* Remove unrelated lcli addition

* Update more tests

* Merge branch 'unstable' into electra

* Add comment for test-suite lcli override

* Merge branch 'unstable' into electra

* Cleanup

* Merge branch 'unstable' into electra

* Apply suggestions

* Merge branch 'unstable' into electra

* Merge sigp/unstable into electra

* Merge branch 'unstable' into electra

.github/workflows/test-suite.yml

@@ -309,7 +309,7 @@ jobs:
       run: |
           make
     - name: Install lcli
-      # TODO: uncomment after the version of lcli in https://github.com/sigp/lighthouse/pull/5137 
+      # TODO: uncomment after the version of lcli in https://github.com/sigp/lighthouse/pull/5137
       # is installed on the runners
       # if: env.SELF_HOSTED_RUNNERS == 'false'
       run: make install-lcli