Remove references to @sentry/tracing for node performance

[timfish]

ref getsentry/sentry-javascript#5815 and #6518

This PR updates our instructions to remove the dependency on using the @sentry/tracing package for the node.js SDK and its derivatives. The node.js SDK now enables tracing support by default and the tracing integrations are now available on the Integrations namespace.

Before:

import * as Sentry from '@sentry/node';
import '@sentry/tracing';

Sentry.init({
  dsn: '__DSN__',
  tracesSampleRate: 1.0,
});

import * as Sentry from '@sentry/node';
import * as Tracing from '@sentry/tracing';

Sentry.init({
  dsn: '__DSN__',
  tracesSampleRate: 1.0,
  integrations: [new Tracing.Integrations.Postgres()],
});

After:

import * as Sentry from '@sentry/node';

Sentry.init({
  dsn: '__DSN__',
  tracesSampleRate: 1.0,
  integrations: [...Sentry.autoDiscoverNodePerformanceMonitoringIntegrations()],
});

import * as Sentry from '@sentry/node';

Sentry.init({
  dsn: '__DSN__',
  tracesSampleRate: 1.0,
  integrations: [new Sentry.Integrations.Postgres()],
});

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[AbhiPrasad]

cc @JonasBa - we removed the tracing package requirement!