Unreal Engine: Add migration guide

[tustanivsky]

This PR adds Unreal Engine SDK migration guide for the upcoming 1.0.0 plugin release.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
sentry-docs	❌ Failed (Inspect)			Jul 21, 2025 0:00am

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
develop-docs	⬜️ Ignored (Inspect)	Visit Preview		Jul 21, 2025 0:00am

[codecov]

Bundle Report

Changes will decrease total bundle size by 935.19kB (-4.21%) ⬇️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-client-array-push	9.84MB	-6 bytes (-0.0%) ⬇️
sentry-docs-server-cjs	11.04MB	-935.18kB (-7.81%) ⬇️

Affected Assets, Files, and Routes:

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	881.08kB	-0.0%
static/chunks/1831-*.js	-3 bytes	423.46kB	-0.0%
server/middleware-*.js	5.55kB	6.55kB	555.3% ⚠️
server/middleware-*.js	-5.55kB	1.0kB	-84.74%
static/K5a-*.js (New)	684 bytes	684 bytes	100.0% 🚀
static/K5a-*.js (New)	77 bytes	77 bytes	100.0% 🚀
static/-*.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️
static/-*.js (Deleted)	-684 bytes	0 bytes	-100.0% 🗑️

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

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
1729.js	-3 bytes	1.67MB	-0.0%
../instrumentation.js	-3 bytes	999.78kB	-0.0%
9523.js	-3 bytes	975.72kB	-0.0%
../app/[[...path]]/page.js.nft.json	-311.73kB	410.84kB	-43.14%
../app/platform-redirect/page.js.nft.json	-311.73kB	410.75kB	-43.15%
../app/sitemap.xml/route.js.nft.json	-311.73kB	408.73kB	-43.27%