[DOCS-9372] Move tracking stuff from setup to advanced config

[rtrieu]

What does this PR do? What is the motivation?

• Moves some tracking config info from the Setup page to Advanced Configuration for iOS, Flutter, React Native, Expo, and Roku
• Fixes the ordering of links

Note: This PR does not contain new content; it moves around existing content from one page to another.

Merge instructions

Merge readiness:

• Ready for merge

Merge queue is enabled in this repo. To have it automatically merged after it receives the required reviews, create the PR (from a branch that follows the <yourname>/description naming convention) and then add the following PR comment:

/merge

Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/rtrieu/docs-9372-move-setup-to-advanced-config-rum/real_user_monitoring/mobile_and_tv_monitoring/flutter/advanced_configuration
• https://docs-staging.datadoghq.com/rtrieu/docs-9372-move-setup-to-advanced-config-rum/real_user_monitoring/mobile_and_tv_monitoring/flutter/setup
• https://docs-staging.datadoghq.com/rtrieu/docs-9372-move-setup-to-advanced-config-rum/real_user_monitoring/mobile_and_tv_monitoring/ios/advanced_configuration
• https://docs-staging.datadoghq.com/rtrieu/docs-9372-move-setup-to-advanced-config-rum/real_user_monitoring/mobile_and_tv_monitoring/ios/setup
• https://docs-staging.datadoghq.com/rtrieu/docs-9372-move-setup-to-advanced-config-rum/real_user_monitoring/mobile_and_tv_monitoring/kotlin_multiplatform/advanced_configuration
• https://docs-staging.datadoghq.com/rtrieu/docs-9372-move-setup-to-advanced-config-rum/real_user_monitoring/mobile_and_tv_monitoring/kotlin_multiplatform/setup
• https://docs-staging.datadoghq.com/rtrieu/docs-9372-move-setup-to-advanced-config-rum/real_user_monitoring/mobile_and_tv_monitoring/react_native/advanced_configuration
• https://docs-staging.datadoghq.com/rtrieu/docs-9372-move-setup-to-advanced-config-rum/real_user_monitoring/mobile_and_tv_monitoring/react_native/setup/expo
• https://docs-staging.datadoghq.com/rtrieu/docs-9372-move-setup-to-advanced-config-rum/real_user_monitoring/mobile_and_tv_monitoring/react_native/setup/reactnative
• https://docs-staging.datadoghq.com/rtrieu/docs-9372-move-setup-to-advanced-config-rum/real_user_monitoring/mobile_and_tv_monitoring/roku/advanced_configuration
• https://docs-staging.datadoghq.com/rtrieu/docs-9372-move-setup-to-advanced-config-rum/real_user_monitoring/mobile_and_tv_monitoring/roku/setup