[wobs] update tracing docs to include compat date

[nevikashah]

Summary

• adds tracing compat flag info to compat flag docs
• add compat flag info to tracing docs
• adds changelog on tracing (including compat flag change)

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/assets/images/	@cloudflare/pm-changelogs, @cloudflare/pcx-technical-writing
/src/content/changelog/	@cloudflare/pm-changelogs, @cloudflare/pcx-technical-writing
/src/content/compatibility-flags/	@irvinebroque, @mikenomitch, @GregBrimble, @cloudflare/pcx-technical-writing
/src/content/docs/workers/observability/	@irvinebroque, @mikenomitch, @nevikashah, @kodster28, @cloudflare/pcx-technical-writing
/src/content/partials/workers/	@cloudflare/workers-docs, @GregBrimble, @irvinebroque, @mikenomitch, @WalshyDev, @cloudflare/deploy-config, @cloudflare/pcx-technical-writing, @kodster28, @cloudflare/wrangler, @cloudflare/workers-runtime-1

[github-actions]

Preview URL: https://2461e71b.preview.developers.cloudflare.com
Preview Branch URL: https://nevi-tracing-compatdate.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/changelog/2025-11-06-automatic-tracing/	https://nevi-tracing-compatdate.preview.developers.cloudflare.com/changelog/2025-11-06-automatic-tracing/
https://developers.cloudflare.com/workers/observability/traces/	https://nevi-tracing-compatdate.preview.developers.cloudflare.com/workers/observability/traces/

[irvinebroque]

✅ so you have it