Publish ClusterDescriptionChangedEvent on topology close

[rozza]

As well as add Topology events to structured logging

JAVA-5229

[Copilot]

Pull Request Overview

Adds support for publishing and structured logging of topology lifecycle events (opening, description changed, closed) and updates the unified SDAM tests to separate and validate these new topology events.

• Un-skip existing unified tests for topology events and implement separation of topology vs SDAM events in UnifiedTest.java.
• Extend EventMatcher and ContextElement to assert topology events and map cluster events to topology* types.
• Introduce structured logging calls (logTopologyOpening, logTopologyDescriptionChanged, logTopologyClosedEvent) and new TOPOLOGY component in the logging layer.

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
UnifiedTestModifications.java	Re-enable previously skipped topology-emitting SDAM tests
UnifiedTest.java	Separate topology and SDAM events; add TOPOLOGY_EVENT_NAMES and assertions
EventMatcher.java	Add assertTopologyEventsEquality and update getEventType to map cluster events
ContextElement.java	New context elements and serializers for topology events
LogMessage.java	Add TOPOLOGY component and related entry names for structured logging
LoadBalancedCluster.java	Emit and log ClusterClosedEvent as topology closed event
BaseCluster.java	Publish topology opening/changed/closed events and structured logs
ClusterOpeningEvent.java, ClusterDescriptionChangedEvent.java, ClusterClosedEvent.java	Javadoc updates to clarify synonymous “Topology” terminology

Comments suppressed due to low confidence (1)

driver-core/src/main/com/mongodb/internal/connection/BaseCluster.java:635

• The new structured logging methods (logTopologyOpening, logTopologyDescriptionChanged, logTopologyClosedEvent) should be covered by unit tests to ensure the logging output remains correct over time.

static void logTopologyOpening(

[NathanQingyangXu]

Overall great!
with some minor details to improve.