docs(js): Add docs for sentryHandleRequest

[chargome]

DO NOT MERGE UNTIL getsentry/sentry-javascript#15787 is merged

documents getsentry/sentry-javascript#15787

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
sentry-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 25, 2025 3:56pm

2 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
changelog	⬜️ Ignored (Inspect)			Mar 25, 2025 3:56pm
develop-docs	⬜️ Ignored (Inspect)			Mar 25, 2025 3:56pm

[codecov]

Bundle Report

Changes will decrease total bundle size by 15 bytes (-0.0%) ⬇️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-server-cjs	10.68MB	-9 bytes (-0.0%) ⬇️
sentry-docs-client-array-push	9.98MB	-6 bytes (-0.0%) ⬇️

Affected Assets, Files, and Routes:

view changes for bundle: sentry-docs-server-cjs

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
7517.js	-3 bytes	1.66MB	-0.0%
../instrumentation.js	-3 bytes	910.93kB	-0.0%
7688.js	-3 bytes	886.9kB	-0.0%

view changes for bundle: sentry-docs-client-array-push

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
static/chunks/pages/_app-*.js	-3 bytes	893.8kB	-0.0%
static/chunks/8429-*.js	-3 bytes	371.26kB	-0.0%
static/Oq-*.js (New)	581 bytes	581 bytes	100.0% 🚀
static/Oq-*.js (New)	77 bytes	77 bytes	100.0% 🚀
static/pn0GqN9BbJ1tnw6kdY2dd/_buildManifest.js (Deleted)	-581 bytes	0 bytes	-100.0% 🗑️
static/pn0GqN9BbJ1tnw6kdY2dd/_ssgManifest.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️