Use functional options for --blob-retention-epochs (#13283)

* blob retention period functional opts

* missed unstaged change

* missed other init after cleardb

* fix ineffassign

* fix dup import

* config failsafe for tests

---------

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

tools/interop/export-genesis/BUILD.bazel

@@ -7,7 +7,7 @@ go_library(
     importpath = "github.com/prysmaticlabs/prysm/v4/tools/interop/export-genesis",
     visibility = ["//visibility:private"],
     deps = [
-        "//beacon-chain/db:go_default_library",
+        "//beacon-chain/db/kv:go_default_library",
         "//io/file:go_default_library",
     ],
 )

tools/interop/export-genesis/main.go

@@ -5,7 +5,7 @@ import (
 	"fmt"
 	"os"
 
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/db"
+	"github.com/prysmaticlabs/prysm/v4/beacon-chain/db/kv"
 	"github.com/prysmaticlabs/prysm/v4/io/file"
 )
 
@@ -21,7 +21,7 @@ func main() {
 
 	fmt.Printf("Reading db at %s and writing ssz output to %s.\n", os.Args[1], os.Args[2])
 
-	d, err := db.NewDB(context.Background(), os.Args[1])
+	d, err := kv.NewKVStore(context.Background(), os.Args[1])
 	if err != nil {
 		panic(err)
 	}