HFE - Fix statistic to count also lazy expired and rename INFO params (#13372)

* INFO command : rename `hashes_with_expiry_fields` to `subexpiry`
* INFO command : rename `expired_hash_fields` to `expired_subkeys`
* Fix statistic of `expired_subkeys` to count also lazy expired
* Remove TODOs comments leftover in TCL
* Fix potential flaky test of rdb load of hash-field-expiration

tests/support/util.tcl

@@ -293,7 +293,6 @@ proc findKeyWithType {r type} {
 
 proc createComplexDataset {r ops {opt {}}} {
     set useexpire [expr {[lsearch -exact $opt useexpire] != -1}]
-    # TODO: Remove usehexpire on next commit, when RDB will support replication
     set usehexpire [expr {[lsearch -exact $opt usehexpire] != -1}]
 
     if {[lsearch -exact $opt usetag] != -1} {