Unreal Engine plugin documentation update

[tustanivsky]

This PR introduces the following changes to Unreal Engine plugin docs:

• Add tracing and trace propagation features description #470, #631
• Add notice that symbol upload can be enabled via env variable #636
• Add notice about Android Gradle plugin fallback #633
• Add notice that session tracking requires UE 5.2 or newer #496
• Add options for automatic breadcrumbs #522
• Add notice about screenshot attachment #582

[vercel[bot]]

@tustanivsky is attempting to deploy a commit to the Sentry Team on Vercel.

A member of the Team first needs to authorize it.

[tustanivsky]

There seem to be 2 links that lead to non-existing pages

Good catch - we were entirely missing the Configuration/Sampling section in docs which I've added with the latest commit.

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
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[bruno-garcia]

@tustanivsky CI seems unhappy

[bruno-garcia]

I've approved the vercel build, lets see

[geoffg-sentry]

Troubleshooting some vercel issues with @bitsandfoxes, I've authorized the vercel changes