ilm: Handle DeleteAllVersions action differently for DEL markers (#19481)

i.e., this rule element doesn't apply to DEL markers.

This is a breaking change to how ExpiredObejctDeleteAllVersions
functions today. This is necessary to avoid the following highly probable
footgun scenario in the future.

Scenario:
The user uses tags-based filtering to select an object's time to live(TTL). 
The application sometimes deletes objects, too, making its latest
version a DEL marker. The previous implementation skipped tag-based filters
if the newest version was DEL marker, voiding the tag-based TTL. The user is
surprised to find objects that have expired sooner than expected.

* Add DelMarkerExpiration action

This ILM action removes all versions of an object if its
the latest version is a DEL marker.

```xml
<DelMarkerObjectExpiration>
    <Days> 10 </Days>
</DelMarkerObjectExpiration>
```

1. Applies only to objects whose,
  • The latest version is a DEL marker.
  • satisfies the number of days criteria
2. Deletes all versions of this object
3. Associated rule can't have tag-based filtering

Includes,
- New bucket event type for deletion due to DelMarkerExpiration

internal/bucket/lifecycle/delmarker-expiration.go

@@ -0,0 +1,74 @@
+// Copyright (c) 2024 MinIO, Inc.
+//
+// This file is part of MinIO Object Storage stack
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package lifecycle
+
+import (
+	"encoding/xml"
+	"time"
+)
+
+var errInvalidDaysDelMarkerExpiration = Errorf("Days must be a positive integer with DelMarkerExpiration")
+
+// DelMarkerExpiration used to xml encode/decode ILM action by the same name
+type DelMarkerExpiration struct {
+	XMLName xml.Name `xml:"DelMarkerExpiration"`
+	Days    int      `xml:"Days,omitempty"`
+}
+
+// Empty returns if a DelMarkerExpiration XML element is empty.
+// Used to detect if lifecycle.Rule contained a DelMarkerExpiration element.
+func (de DelMarkerExpiration) Empty() bool {
+	return de.Days == 0
+}
+
+// UnmarshalXML decodes a single XML element into a DelMarkerExpiration value
+func (de *DelMarkerExpiration) UnmarshalXML(dec *xml.Decoder, start xml.StartElement) error {
+	type delMarkerExpiration DelMarkerExpiration
+	var dexp delMarkerExpiration
+	err := dec.DecodeElement(&dexp, &start)
+	if err != nil {
+		return err
+	}
+
+	if dexp.Days <= 0 {
+		return errInvalidDaysDelMarkerExpiration
+	}
+
+	*de = DelMarkerExpiration(dexp)
+	return nil
+}
+
+// MarshalXML encodes a DelMarkerExpiration value into an XML element
+func (de DelMarkerExpiration) MarshalXML(enc *xml.Encoder, start xml.StartElement) error {
+	if de.Empty() {
+		return nil
+	}
+
+	type delMarkerExpiration DelMarkerExpiration
+	return enc.EncodeElement(delMarkerExpiration(de), start)
+}
+
+// NextDue returns upcoming DelMarkerExpiration date for obj if
+// applicable, returns false otherwise.
+func (de DelMarkerExpiration) NextDue(obj ObjectOpts) (time.Time, bool) {
+	if !obj.IsLatest || !obj.DeleteMarker {
+		return time.Time{}, false
+	}
+
+	return ExpectedExpiryTime(obj.ModTime, de.Days), true
+}