EMBR-9818 chore: docs for crossorigin-anonymous on CDN

[jpmunz]

Goal

Recommend setting https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Attributes/crossorigin#anonymous when loading our snippet for CDN, this prevents sending user credentials in the request and prevents errors that originate in our script from being obfuscated

[github-actions]

Chrome DevTools Protocol Tracing (Script: 107.87ms, Heap: 13.31MB)

	Number of Requests	Size of Requests	Script Duration	Task Duration	Heap Used Size
Requests	+3 requests	+29.84 KB
Page Loaded			+15.05 ms	+8.75 ms	+0.91 MB
Generate 100 fetch requests			+15.47 ms	+64.34 ms	+1.99 MB
Generate 100 XHR requests			+39.84 ms	+107.48 ms	+2.30 MB
Click 100 buttons and generate 100 logs			+30.92 ms	+40.58 ms	+2.91 MB
Throw a 100 exceptions			-1.10 ms	+15.21 ms	+2.16 MB
End Session			+7.70 ms	+14.72 ms	+3.03 MB
Total	+3 requests	+29.84 KB	+107.87 ms	+251.08 ms	+13.31 MB

Lighthouse (Script Eval: 50.92ms)

	Difference	Description
Total Blocking Time	0 ms	Difference in Total Blocking Time: Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more about the Total Blocking Time metric.
Main Thread Time	+71.05 ms	Difference in Main Thread Time: Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work
Script Evaluation Time	+50.92 ms	Difference in Script Evaluation Time: Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Platform Tests (vite-7 gzip: 47.99KB)

vite-7 Platform Tests

	Total Uncompressed Size	Total Gzip Size
vite-7 - esnext	+164.67 KB	+47.99 KB
vite-7 - es2015	+171.51 KB	+49.67 KB

vite-otel-latest Platform Tests

	Total Uncompressed Size	Total Gzip Size
vite-otel-latest - esnext	+163.74 KB	+49.69 KB
vite-otel-latest - es2015	+170.50 KB	+51.32 KB

webpack-5 Platform Tests

	Total Uncompressed Size	Total Gzip Size
webpack-5 - esnext	+121.11 KB	+43.18 KB
webpack-5 - es2015	+122.22 KB	+44.65 KB