chore: upgrade to React Native 0.86 / Expo SDK 57

[diegolmello]

Proposed changes

Upgrade branch for React Native 0.86 / Expo SDK 57.

The spec treats the de-interop swaps and the expo-audio/expo-video migration as landed on develop, but their PRs are still open. This branch starts from develop and carries them as cherry-picks so the upgrade work can proceed on top of them without waiting:

• chore: replace react-native-restart with expo reloadAppAsync #7684 chore: replace react-native-restart with expo reloadAppAsync
• chore: replace react-native-background-timer with setInterval #7685 chore: replace react-native-background-timer with setInterval
• chore: bump react-native-localize to 3.7.0 #7686 chore: bump react-native-localize to 3.7.0
• chore: replace react-native-file-viewer with expo-quick-look #7687 chore: replace react-native-file-viewer with expo-quick-look
• chore: migrate from expo-av to expo-audio and expo-video #6719 chore: migrate from expo-av to expo-audio and expo-video (squashed into a single commit)
• chore: bump react-native-mmkv and react-native-nitro-modules #7692 chore: bump react-native-mmkv and react-native-nitro-modules (two change commits; develop merge omitted)

Each of the first four is a single cherry-picked commit. #6719 was squash-merged because its history contains merges from develop. Its only conflict was two import lines in MessageComposer.test.tsx, resolved by keeping both sides.

#7692 was cherry-picked as two commits, preserving the MMKV mock and test updates. Its Podfile.lock conflict was resolved by keeping this branch’s removal of the stale RNKeychain checksum.

Once those PRs merge into develop, this branch is rebased or merged so the cherry-picks drop out and only the upgrade commits remain.

The upgrade itself (toolchain floors and patches, dependencies, iOS native, Android native, jest, e2e) lands as ordered commits on this branch and is not yet included.

Issue(s)

https://rocketchat.atlassian.net/browse/NATIVE-1576

How to test or reproduce

Nothing to test yet beyond what the cherry-picked PRs already describe. The smoke checklist from the ticket will be added here once the upgrade commits land.

Screenshots

Types of changes

• Improvement (non-breaking change which improves a current function)

Checklist

• Lint and unit tests pass locally with my changes

Further comments

Epic: https://rocketchat.atlassian.net/browse/NATIVE-1561

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