chore: Custom GitHub runner image with Unreal docker pre-installed

[tustanivsky]

#skip-chagelog

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

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Bug Fixes 🐛

• Prevent potential script injection in crash-reporter-build workflow by fix-it-felix-sentry in #1324

Internal Changes 🔧

Deps

• Update Native SDK to v0.13.6 by github-actions in #1339
• Update Android Gradle Plugin to v6.4.0 by github-actions in #1338
• Update Cocoa SDK to v9.10.0 by github-actions in #1335
• Update Java SDK to v8.38.0 by github-actions in #1336
• Update Native SDK to v0.13.5 by github-actions in #1334
• Update Cocoa SDK to v9.9.0 by github-actions in #1332
• Update CLI to v3.3.5 by github-actions in #1323

Other

• Custom GitHub runner image with Unreal docker pre-installed by tustanivsky in #1340

• Update validate-pr workflow by stephanie-anderson in #1328

Other

• Fix intermittent crash when capturing screenshots due to invalid viewport by tustanivsky in #1331
• Suppress superfluous warnings when detecting for SteamOS by yangskyboxlabs in #1326
• Add out-of-process screenshot capturing on Windows by tustanivsky in #1325

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