fix(serverless) Do not change DSN in Serverless integration

[antonpirker]

In AWS Lambda Integration of V7 the DSN of the user is changed to point to localhost:3000 (that is the URL of the Lambda Extension, that is not yet released)

This breaks the Serverless AWS Lambda Integration, so I disabled "changing the DSN" until the Lambda Extension is released.

Was reported by a user in this PR: #5126

Fixes #5211

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	19.43 KB (added)
@sentry/browser - ES5 CDN Bundle (minified)	60.2 KB (added)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.23 KB (added)
@sentry/browser - ES6 CDN Bundle (minified)	53.82 KB (added)
@sentry/browser - Webpack (gzipped + minified)	19.99 KB (added)
@sentry/browser - Webpack (minified)	65.19 KB (added)
@sentry/react - Webpack (gzipped + minified)	20.02 KB (added)
@sentry/nextjs Client - Webpack (gzipped + minified)	43.76 KB (added)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	25.46 KB (added)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	23.98 KB (added)