rel: Prepare v2.6.0 release (#1207)

## Which problem is this PR solving?

Prepares the v2.6.0 release.

## Short description of the changes

- Add changelog entry
- Add release notes entry

CHANGELOG.md

@@ -1,5 +1,18 @@
 # Refinery Changelog
 
+## 2.6.0 2024-06-17
+
+### Features
+
+- feat: Allow URL encoded dataset in libhoney endpoint paths (#1199) | @MikeGoldsmith
+- feat: Add OTLP log endpoints (gRPC & HTTP) (#1187) | @MikeGoldsmith
+
+### Maintenance
+
+- maint: Bump libhoney-go to v1.23.1 (#1200) | @MikeGoldsmith
+- maint: bump libhoney-go to v1.23.0 (#1192) | @MikeGoldsmith
+- maint: bump Husky to v0.30.0 (#1190) | @TylerHelmuth
+
 ## 2.5.2 2024-05-22
 
 This release fixes a race condition in OTel Metrics that caused Refinery to crash.

RELEASE_NOTES.md

@@ -2,6 +2,15 @@
 
 While [CHANGELOG.md](./CHANGELOG.md) contains detailed documentation and links to all the source code changes in a given release, this document is intended to be aimed at a more comprehensible version of the contents of the release from the point of view of users of Refinery.
 
+## Version 2.6.0
+
+With this release, Refinery begins the process of integrating multiple telemetry signal types by handling logs as well as traces.
+Refinery now handles the OpenTelemetry `/logs` endpoints over both gRPC and HTTP:
+- Log records that are associated with a trace by including a TraceID are sampled alongside the trace's spans.
+- Log records that do not have a TraceID are treated like regular events and forwarded directly to Honeycomb.
+
+It also includes support for URL encoded dataset names in the non-OpenTelemetry URL paths.
+
 ## Version 2.5.2
 
 This release fixes a race condition in OTel Metrics that caused Refinery to crash.