CBG-4905: update defualt resolver for blip tester

[gregns1]

CBG-4905

• Alter blip tester client to account for local or remote tombstones when resolving conflict.
• Required changes to the resurrection testing to account for CBL peer resolving in favour of a tombstone

Pre-review checklist

• Removed debug logging (fmt.Print, log.Print, ...)
• Logging sensitive data? Make sure it's tagged (e.g. base.UD(docID), base.MD(dbName))
• Updated relevant information in the API specifications (such as endpoint descriptions, schemas, ...) in docs/api

Dependencies (if applicable)

• Link upstream PRs
• Update Go module dependencies when merged

Integration Tests

• GSI=true,xattrs=true https://jenkins.sgwdev.com/job/SyncGatewayIntegration/183/

[Copilot]

Pull request overview

This PR updates the default conflict resolver for the BLIP tester to handle tombstones when resolving conflicts. The changes ensure that when either the local or remote document is a tombstone, the conflict resolution favors the non-deleted document.

• Updated _resolveConflictLWW to prioritize non-deleted documents over tombstones during conflict resolution
• Added helper functions to determine when conflicts are expected in CBL topologies
• Modified resurrection test logic to handle tombstone convergence when CBL resolves in favor of its own tombstone

Reviewed changes

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

File	Description
rest/utilities_testing_blip_client.go	Enhanced conflict resolver to check for tombstones and prefer non-deleted documents
topologytest/peer_test.go	Added helper functions to identify server-side peers and determine expected conflicts in CBL topologies
topologytest/multi_actor_no_conflict_test.go	Updated resurrection test to wait for tombstone convergence when CBL conflicts are expected

[torcolvin]

Make sure to run topologytests with CBS (you can do this locally with SG_TEST_TOPOLOGY_TESTS=true or with jenkins job, https://jenkins.sgwdev.com/job/TopologyTests/)

[torcolvin]

one tweak and I think I'm fine with this, I think I declare:

isDelete := opts.isDelete

And then use that variable to use a local variable. The reason for this is to match newBody and newVersion behavior and to make the options struct effectively immutable to make this easier to do debugging.

[gregns1]

Pushed update for this but I can't get onto Jenkins with this netspoke stuff. Going to bring this up to IT soon.