docs(javascript): Add docs for GraphQL Client

[s1gr1d]

DESCRIBE YOUR PR

Documents PR getsentry/sentry-javascript#13783 mentioned in issue getsentry/sentry-javascript#13399

closes #13800

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PRE-MERGE CHECKLIST

Make sure you've checked the following before merging your changes:

• Checked Vercel preview for correctness, including links
• PR was reviewed and approved by any necessary SMEs (subject matter experts)
• PR was reviewed and approved by a member of the Sentry docs team

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
sentry-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 23, 2025 8:52am

2 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
changelog	⬜️ Ignored (Inspect)	Visit Preview		May 23, 2025 8:52am
develop-docs	⬜️ Ignored (Inspect)	Visit Preview		May 23, 2025 8:52am

[codecov]

Bundle Report

Changes will increase total bundle size by 261 bytes (0.0%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-server-cjs	11.2MB	267 bytes (0.0%) ⬆️
sentry-docs-client-array-push	9.51MB	-6 bytes (-0.0%) ⬇️

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	868.7kB	-0.0%
static/chunks/8165-*.js	-3 bytes	410.1kB	-0.0%
static/j4Ki8fucEOrfCf-*.js (New)	77 bytes	77 bytes	100.0% 🚀
static/j4Ki8fucEOrfCf-*.js (New)	578 bytes	578 bytes	100.0% 🚀
static/ZlqCzUQsxqrW9fkiaBkWv/_buildManifest.js (Deleted)	-578 bytes	0 bytes	-100.0% 🗑️
static/ZlqCzUQsxqrW9fkiaBkWv/_ssgManifest.js (Deleted)	-77 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	1.75MB	-0.0%
../instrumentation.js	-3 bytes	1.08MB	-0.0%
9523.js	-3 bytes	1.05MB	-0.0%
../app/[[...path]]/page.js.nft.json	92 bytes	398.23kB	0.02%
../app/platform-redirect/page.js.nft.json	92 bytes	398.14kB	0.02%
../app/sitemap.xml/route.js.nft.json	92 bytes	396.11kB	0.02%