chore: Add size limit reports on PRs for Cloudflare

[JPeer264]

Cloudflare does have a free tier limit of 3mb: https://developers.cloudflare.com/workers/platform/limits/#worker-size

It would be too bad if we ship something for Cloudflare and by accident ship something which is super costly. I didn't add a limit yet, but we can add one once it makes sense

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

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New Features ✨

• (core, node) Portable Express integration by isaacs in #19928
• (deno) Add denoRuntimeMetricsIntegration by chargome in #20023
• (deps) Bump @xmldom/xmldom from 0.8.3 to 0.8.12 by dependabot in #20066

Bug Fixes 🐛

• (aws-serverless) Add timeout to _endSpan forceFlush to prevent Lambda hanging by logaretm in #20064
• (cloudflare) Ensure every request instruments functions by JPeer264 in #20044
• (gatsby) Fix errorHandler signature to match bundler-plugin-core API by JPeer264 in #20048

Internal Changes 🔧

Core

• Extract shared endStreamSpan for AI integrations by nicohrubec in #20021
• Remove provider-specific AI span attributes in favor of gen_ai attributes in sentry conventions by nicohrubec in #20011

Other

• Add size limit reports on PRs for Cloudflare by JPeer264 in #20055

• Update validate-pr workflow by stephanie-anderson in #20072
• Remove unused tsconfig-template folder by mydea in #20067

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[github-actions]

node-overhead report 🧳

Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.

Scenario	Requests/s	% of Baseline	Prev. Requests/s	Change %
GET Baseline	8,539	-	11,213	-24%
GET With Sentry	1,562	18%	1,972	-21%
GET With Sentry (error only)	6,016	70%	7,611	-21%
POST Baseline	1,161	-	1,281	-9%
POST With Sentry	571	49%	627	-9%
POST With Sentry (error only)	1,009	87%	1,132	-11%
MYSQL Baseline	3,107	-	3,494	-11%
MYSQL With Sentry	358	12%	456	-21%
MYSQL With Sentry (error only)	2,526	81%	2,814	-10%

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