chore(otel): Update installation instructions (#6262)

1. Convert from ES modules to `require`
2. Specify to set the `instrumenter` option to turn off Sentry instrumentation
3. Clean up imports 
4. Add `sdk.start` command to match otel docs: https://opentelemetry.io/docs/instrumentation/js/getting-started/nodejs/#setup

Author: AbhiPrasad

packages/opentelemetry-node/README.md

@@ -35,15 +35,27 @@ Note that `@sentry/opentelemetry-node` depends on the following peer dependencie
 You need to register the `SentrySpanProcessor` and `SentryPropagator` with your OpenTelemetry installation:
 
 ```js
-import * as Sentry from '@sentry/node';
-import { SentrySpanProcessor } from '@sentry/opentelemetry-node';
-import * as otelApi from '@opentelemetry/api';
-import { getNodeAutoInstrumentations } from  '@opentelemetry/auto-instrumentations-node';
-import { OTLPTraceExporter } from '@opentelemetry/exporter-trace-otlp-grpc';
+const Sentry = require("@sentry/node");
+const {
+  SentrySpanProcessor,
+  SentryPropagator,
+} = require("@sentry/opentelemetry-node");
+
+const opentelemetry = require("@opentelemetry/sdk-node");
+const otelApi = require("@opentelemetry/api");
+const {
+  getNodeAutoInstrumentations,
+} = require("@opentelemetry/auto-instrumentations-node");
+const {
+  OTLPTraceExporter,
+} = require("@opentelemetry/exporter-trace-otlp-grpc");
 
 // Make sure to call `Sentry.init` BEFORE initializing the OpenTelemetry SDK
 Sentry.init({
   dsn: '__DSN__',
+  tracesSampleRate: 1.0,
+  // set the instrumenter to use OpenTelemetry instead of Sentry
+  instrumenter: 'otel',
   // ...
 });
 
@@ -57,6 +69,8 @@ const sdk = new opentelemetry.NodeSDK({
 });
 
 otelApi.propagation.setGlobalPropagator(new SentryPropagator());
+
+sdk.start();
 ```
 
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