chore(metrics): remove deprecated metrics doc

[obostjancic]

Removes https://develop.sentry.dev/sdk/telemetry/metrics/ and all related content

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
develop-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 2, 2025 2:56pm
sentry-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 2, 2025 2:56pm

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
changelog	⬜️ Ignored (Inspect)	Visit Preview		Jun 2, 2025 2:56pm

[codecov]

Bundle Report

Changes will decrease total bundle size by 3.95kB (-0.02%) ⬇️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-server-cjs	11.22MB	-3.89kB (-0.03%) ⬇️
sentry-docs-edge-server-array-push	379.18kB	-52 bytes (-0.01%) ⬇️
sentry-docs-client-array-push	9.77MB	-6 bytes (-0.0%) ⬇️

Affected Assets, Files, and Routes:

view changes for bundle: sentry-docs-edge-server-array-push

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
src/middleware.js	-52 bytes	206.91kB	-0.03%

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	-1.29kB	398.43kB	-0.32%
../app/platform-redirect/page.js.nft.json	-1.29kB	398.35kB	-0.32%
../app/sitemap.xml/route.js.nft.json	-1.29kB	396.32kB	-0.33%

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/qeENvUZyA1GENeP2sxzUY/_buildManifest.js (New)	616 bytes	616 bytes	100.0% 🚀
static/qeENvUZyA1GENeP2sxzUY/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/P2DzsjQm9WMpYMG-*.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️
static/P2DzsjQm9WMpYMG-*.js (Deleted)	-616 bytes	0 bytes	-100.0% 🗑️