xds: Remove unused opencensus-proto dependency

opencensus-proto is old generated code, which is not compatible with
protobuf-java 4.27.2 and may not be fixed since the project is dead.
Since it is unused, I think this doesn't cause any trouble for
downstream users trying to use protobuf-java 4.x. Related to #11015.

Author: ejona86

gradle/libs.versions.toml

@@ -75,7 +75,6 @@ opencensus-contrib-grpc-metrics = { module = "io.opencensus:opencensus-contrib-g
 opencensus-exporter-stats-stackdriver = { module = "io.opencensus:opencensus-exporter-stats-stackdriver", version.ref = "opencensus" }
 opencensus-exporter-trace-stackdriver = { module = "io.opencensus:opencensus-exporter-trace-stackdriver", version.ref = "opencensus" }
 opencensus-impl = { module = "io.opencensus:opencensus-impl", version.ref = "opencensus" }
-opencensus-proto = "io.opencensus:opencensus-proto:0.2.0"
 opentelemetry-api = "io.opentelemetry:opentelemetry-api:1.39.0"
 opentelemetry-exporter-prometheus = "io.opentelemetry:opentelemetry-exporter-prometheus:1.39.0-alpha"
 opentelemetry-gcp-resources = "io.opentelemetry.contrib:opentelemetry-gcp-resources:1.36.0-alpha"

xds/build.gradle

@@ -43,8 +43,7 @@ configurations {
 dependencies {
     thirdpartyCompileOnly libraries.javax.annotation
     thirdpartyImplementation project(':grpc-protobuf'),
-            project(':grpc-stub'),
-            libraries.opencensus.proto
+            project(':grpc-stub')
     compileOnly sourceSets.thirdparty.output
     implementation project(':grpc-stub'),
             project(':grpc-core'),

xds/third_party/envoy/import.sh

@@ -67,10 +67,8 @@ envoy/config/trace/v3/datadog.proto
 envoy/config/trace/v3/dynamic_ot.proto
 envoy/config/trace/v3/http_tracer.proto
 envoy/config/trace/v3/lightstep.proto
-envoy/config/trace/v3/opencensus.proto
 envoy/config/trace/v3/opentelemetry.proto
 envoy/config/trace/v3/service.proto
-envoy/config/trace/v3/trace.proto
 envoy/config/trace/v3/zipkin.proto
 envoy/data/accesslog/v3/accesslog.proto
 envoy/extensions/clusters/aggregate/v3/cluster.proto