Add support for fulu fork epoch and bpo schedule (#15975)

* wip

* fixing tests

* adding script to update workspace for eth clients

* updating test sepc to 1.6.0 and fixing broadcaster test

* fix specrefs

* more ethspecify fixes

* still trying to fix ethspecify

* fixing attestation tests

* fixing sha for consensus specs

* removing script for now until i have something more standard

* fixing more p2p tests

* fixing discovery tests

* attempting to fix discovery test flakeyness

* attempting to fix port binding issue

* more attempts to fix flakey tests

* Revert "more attempts to fix flakey tests"

This reverts commit 25e8183703.

* Revert "attempting to fix port binding issue"

This reverts commit 583df8000d.

* Revert "attempting to fix discovery test flakeyness"

This reverts commit 3c76525870.

* Revert "fixing discovery tests"

This reverts commit 8c701bf3b9.

* Revert "fixing more p2p tests"

This reverts commit 140d5db203.

* Revert "fixing attestation tests"

This reverts commit 26ded244cb.

* fixing attestation tests

* fixing more p2p tests

* fixing discovery tests

* attempting to fix discovery test flakeyness

* attempting to fix port binding issue

* more attempts to fix flakey tests

* changelog

* fixing import

* adding some missing dependencies, but  TestService_BroadcastAttestationWithDiscoveryAttempts is still failing

* attempting to fix test

* reverting test as it migrated to other pr

* reverting test

* fixing test from merge

* Fix `TestService_BroadcastAttestationWithDiscoveryAttempts`.

* Fix again `TestService_Start_OnlyStartsOnce`.

* fixing TestListenForNewNodes

* removing manual set of fulu epoch

* missed a few

* fixing subnet test

* Update beacon-chain/rpc/eth/config/handlers_test.go

Co-authored-by: Preston Van Loon <pvanloon@offchainlabs.com>

* removing a few more missed spots of reverting fulu epoch setting

* updating test name based on feedback

* fixing rest apis, they actually need the setting of the epoch due to the guard

---------

Co-authored-by: Manu NALEPA <enalepa@offchainlabs.com>
Co-authored-by: Preston Van Loon <pvanloon@offchainlabs.com>

specrefs/.ethspecify.yml

@@ -1,4 +1,4 @@
-version: v1.6.0-beta.2
+version: v1.6.0
 style: full
 
 specrefs: