ref(java): add Maven plugin to Java guides

[lcian]

DESCRIBE YOUR PR

Adds Maven plugin instructions on some of the Java docs (those where the Gradle plugin is also mentioned)
Closes getsentry/sentry-java#4112

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
develop-docs	⬜️ Ignored (Inspect)	Visit Preview		Feb 25, 2025 11:51am
sentry-docs	⬜️ Ignored (Inspect)	Visit Preview		Feb 25, 2025 11:51am
changelog	⬜️ Skipped (Inspect)			Feb 25, 2025 11:51am

[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	10.71MB	-9 bytes (-0.0%) ⬇️
sentry-docs-client-array-push	9.38MB	-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	865.95kB	-0.0%
static/chunks/7801-*.js	-3 bytes	391.02kB	-0.0%
server/middleware-*.js	-5.55kB	1.0kB	-84.74%
server/middleware-*.js	5.55kB	6.55kB	555.3% ⚠️
static/V8BmFgWymnonOkCohxxg2/_buildManifest.js (New)	578 bytes	578 bytes	100.0% 🚀
static/V8BmFgWymnonOkCohxxg2/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/vMgNAVW2KfriTTw8MyPLr/_buildManifest.js (Deleted)	-578 bytes	0 bytes	-100.0% 🗑️
static/vMgNAVW2KfriTTw8MyPLr/_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	1.64MB	-0.0%
../instrumentation.js	-3 bytes	968.3kB	-0.0%
9523.js	-3 bytes	944.51kB	-0.0%

[coolguyzone]

🛳️