Config registry (#10683)

* test coverage and updates to config twiddlers

* LoadChainConfigFile error if SetActive conflicts

* lint

* wip working around test issues

* more fixes, mass test updates

* lint

* linting

* thanks deepsource!

* fix undeclared vars

* fixing more undefined

* fix a bug, make a bug, repeat

* gaz

* use stock mainnet in case fork schedule matters

* remove unused KnownConfigs

* post-merge cleanup

* eliminating OverrideBeaconConfig outside tests

* more cleanup of OverrideBeaconConfig outside tests

* config for interop w/ genesis gen support

* improve var name

* API on package instead of exported value

* cleanup remainders of "registry" naming

* Nishant feedback

* add ropstein to configset

* lint

* lint #2

* ✂️

* revert accidental commented line

* check if active is nil (replace called on empty)

* Nishant feedback

* replace OverrideBeaconConfig call

* update interop instructions w/ new flag

* don't let interop replace config set via cli flags

Co-authored-by: kasey <kasey@users.noreply.github.com>

time/slots/countdown_test.go

@@ -13,11 +13,12 @@ import (
 )
 
 func TestCountdownToGenesis(t *testing.T) {
+	params.SetupTestConfigCleanup(t)
 	logrus.SetLevel(logrus.DebugLevel)
 
 	hook := logTest.NewGlobal()
 	params.SetupTestConfigCleanup(t)
-	config := params.BeaconConfig()
+	config := params.BeaconConfig().Copy()
 	config.GenesisCountdownInterval = time.Millisecond * 500
 	params.OverrideBeaconConfig(config)