[Monitor OpenTelemetry Exporter] Update Statsbeat to Count Success Upon Partially Successful Envelopes (Azure#33741)

### Packages impacted by this PR
@azure/monitor-opentelemetry-exporter

### Issues associated with this PR


### Describe the problem that is addressed by this PR
Should adhere to the spec by counting a statsbeat success when some of
the envelopes in a batch are accepted by breeze.

### Checklists
- [x] Added impacted package name to the issue description
- [ ] Does this PR needs any fixes in the SDK Generator?** _(If so,
create an Issue in the
[Autorest/typescript](https://github.com/Azure/autorest.typescript)
repository and link it here)_
- [x] Added a changelog (if necessary)

Author: JacksonWeber

sdk/monitor/monitor-opentelemetry-exporter/CHANGELOG.md

@@ -1,5 +1,12 @@
 # Release History
 
+## 1.0.0-beta.31()
+
+## Other Changes
+
+- Hide iKey in debug logs.
+- Add to statsbeat success count when a batch of envelopes is partially accepted by breeze.
+
 ## 1.0.0-beta.30 (2025-04-09)
 
 ### Features Added
@@ -12,7 +19,6 @@
 - Filter OpenTelemetry semantic attributes from being double recorded as custom dimensions.
 - Add support for detecting the Application Insights shim on internal verison.
 - Do not filter out `_MS.ProcessedByMetricExtractors` value on envelopes.
-- Hide iKey in debug logs.
 
 ## 1.0.0-beta.29 (2025-03-04)
 

sdk/monitor/monitor-opentelemetry-exporter/src/platform/nodejs/baseSender.ts

@@ -103,6 +103,11 @@ export abstract class BaseSender {
           diag.info(result);
           const breezeResponse = JSON.parse(result) as BreezeResponse;
           const filteredEnvelopes: Envelope[] = [];
+          // If we have a partial success, count the succeeded envelopes
+          if (breezeResponse.itemsReceived > 0) {
+            this.networkStatsbeatMetrics?.countSuccess(duration);
+          }
+          // Figure out if we need to either retry or count failures
           if (breezeResponse.errors) {
             breezeResponse.errors.forEach((error) => {
               if (error.statusCode && isRetriable(error.statusCode)) {