feat(angular): Update SDK provider setup docs for Angular 19

[Lms24]

DESCRIBE YOUR PR

This PR updates the Angular provider setup in the Angular "Getting Started" docs page. In Angular 19, the APP_INITIALIZER DI token was deprecated and the new recommended way to provide a dependency (our TraceService) at app start is to use provideAppInitializer and the inject API.

To be clear, this is not a breaking change. But it makes sense for us to document the most up to date way as well.

Also made a minor wording change in the compatibility note

Our SDK is comaptible with Angular 19 since v8.40.0, so this PR can be merged whenever it's approved.

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PRE-MERGE CHECKLIST

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• Checked Vercel preview for correctness, including links
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LEGAL BOILERPLATE

Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.

EXTRA RESOURCES

• Sentry Docs contributor guide

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[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	10.13MB	9 bytes (-0.0%) ⬇️
sentry-docs-client-array-push	9.02MB	6 bytes (-0.0%) ⬇️