Revert the switch to default to dup semantic conventions for http packages

CHANGELOG.md

@@ -26,23 +26,13 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 ### Changed
 
 - Jaeger remote sampler's probabilistic strategy now uses the same sampling algorithm as `trace.TraceIDRatioBased` in `go.opentelemetry.io/contrib/samplers/jaegerremote`. (#6892)
-- Switched the default for `OTEL_SEMCONV_STABILITY_OPT_IN` to emit the v1.26.0 semantic conventions by default in the following modules.
-  - `go.opentelemetry.io/contrib/instrumentation/github.com/emicklei/go-restful/otelrestful`
-  - `go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin`
-  - `go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/mux/otelmux`
-  - `go.opentelemetry.io/contrib/instrumentation/github.com/labstack/echo/otelecho`
-  - `go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace`
-  - `go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp`
 - Improve performance by reducing allocations for http request when using `OTEL_SEMCONV_STABILITY_OPT_IN=http/dup` in the modules below. (#7180)
   - `go.opentelemetry.io/contrib/instrumentation/github.com/emicklei/go-restful/otelrestful`
   - `go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin`
   - `go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/mux/otelmux`
   - `go.opentelemetry.io/contrib/instrumentation/github.com/labstack/echo/otelecho`
   - `go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace`
   - `go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp`
-
-  The `OTEL_SEMCONV_STABILITY_OPT_IN=http/dup` environment variable can be still used to emit both the v1.20.0 and v1.26.0 semantic conventions.
-  It is however impossible to emit only the 1.20.0 semantic conventions, as the next release will drop support for that environment variable. (#6899)
 - Update the Jaeger remote sampler to use "github.com/jaegertracing/jaeger-idl/proto-gen/api_v2" in  `go.opentelemetry.io/contrib/samplers/jaegerremote`. (#7061)
 - Improve performance by reducing allocations in the gRPC stats handler in `go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc`. (#7186)
 - Update `http.route` attribute to support `request.Pattern` in `go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/mux/otelmux`. (#7108)