Update publishing UDP Exporter via npm, not npx (#276)

*Issue #, if available:*
`NPM_CONFIG_PROVENANCE` config setting doesn't apply to npx, but should
apply for npm.

*Description of changes:*
- Use `npm` to publish, similar to how [ADOT Instrumentation is
currently
published](https://github.com/aws-observability/aws-otel-js-instrumentation/blob/v0.7.0/.github/workflows/release-build.yml#L122).

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choice.

Author: jj22ee

.github/workflows/release-udp-exporter.yml

@@ -52,13 +52,13 @@ jobs:
             exit 1
           fi
 
-      # Publish OTLP UDP Exporter to npm
+      # Publish X-Ray UDP Exporter to npm
       - name: Publish to npm
         working-directory: exporters/aws-distro-opentelemetry-exporter-xray-udp
         env:
           NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}
           NPM_CONFIG_PROVENANCE: true
-        run: npx publish
+        run: npm publish
 
       # Publish to GitHub releases
       - name: Create GH release
@@ -70,4 +70,4 @@ jobs:
             --title "Release aws-distro-opentelemetry-exporter-xray-udp v${{ inputs.udp-exporter-version }}" \
             --notes "Please refer to the [Changelog](https://github.com/aws-observability/aws-otel-js-instrumentation/blob/main/exporters/aws-distro-opentelemetry-exporter-xray-udp/CHANGELOG.md) for more details" \
             --draft \
-            "aws-distro-opentelemetry-exporter-xray-udp/v${{ inputs.udp-exporter-version }}"
+            "aws-distro-opentelemetry-exporter-xray-udp/v${{ inputs.udp-exporter-version }}"