fix: support object-remaining-retention-days policy condition (#9259)

This PR also tries to simplify the approach taken in
object-locking implementation by preferential treatment
given towards full validation.

This in-turn has fixed couple of bugs related to
how policy should have been honored when ByPassGovernance
is provided.

Simplifies code a bit, but also duplicates code intentionally
for clarity due to complex nature of object locking
implementation.

pkg/bucket/policy/condition/stringequalsfunc.go

@@ -112,7 +112,6 @@ func valuesToStringSlice(n name, values ValueSet) ([]string, error) {
 	valueStrings := []string{}
 
 	for value := range values {
-		// FIXME: if AWS supports non-string values, we would need to support it.
 		s, err := value.GetString()
 		if err != nil {
 			return nil, fmt.Errorf("value must be a string for %v condition", n)