feat:config:force existing users to opt into new defaults (#10488)

* Config default does not comment out EnableSplitstore

* Loadability check

* Remove test used for debugging

* regexp for properly safe check that config is set

* regexp for safely matching the EnableSpitstore field in the config

* Add instructions for undeleting config and remind users to set splitstore false for full archive

* UpdateConfig small docs and functional opts

* make gen

* Lint

* Fix

* nil pointer check on validate

* Unit testing of EnableSplitstore cases

* Address Review

---------

Co-authored-by: zenground0 <ZenGround0@users.noreply.github.com>

node/repo/fsrepo.go

@@ -545,7 +545,15 @@ func (fsr *fsLockedRepo) Config() (interface{}, error) {
 }
 
 func (fsr *fsLockedRepo) loadConfigFromDisk() (interface{}, error) {
-	return config.FromFile(fsr.configPath, fsr.repoType.Config())
+	var opts []config.LoadCfgOpt
+	if fsr.repoType == FullNode {
+		opts = append(opts, config.SetCanFallbackOnDefault(config.NoDefaultForSplitstoreTransition))
+		opts = append(opts, config.SetValidate(config.ValidateSplitstoreSet))
+	}
+	opts = append(opts, config.SetDefault(func() (interface{}, error) {
+		return fsr.repoType.Config(), nil
+	}))
+	return config.FromFile(fsr.configPath, opts...)
 }
 
 func (fsr *fsLockedRepo) SetConfig(c func(interface{})) error {