chore(otel): Update installation instructions

[AbhiPrasad]

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

[Lms24]

🚀

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	19.5 KB (-0.01% 🔽)
@sentry/browser - ES5 CDN Bundle (minified)	60.29 KB (0%)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.16 KB (0%)
@sentry/browser - ES6 CDN Bundle (minified)	53.63 KB (0%)
@sentry/browser - Webpack (gzipped + minified)	19.9 KB (0%)
@sentry/browser - Webpack (minified)	65.12 KB (0%)
@sentry/react - Webpack (gzipped + minified)	19.92 KB (0%)
@sentry/nextjs Client - Webpack (gzipped + minified)	45.93 KB (0%)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	26.37 KB (+0.01% 🔺)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	24.78 KB (+0.02% 🔺)