Kotlin: fix static code analysis weak warnings (4/n) (#52207)

Summary:
Static code analysis reports several weak warnings, many of which seem to be leftovers after Kotlin migration. This PR addresses quite a few:

- [Redundant curly braces in string template](https://www.jetbrains.com/help/inspectopedia/RemoveCurlyBracesFromTemplate.html)
- [Redundant call to toString() in string template](https://www.jetbrains.com/help/inspectopedia/RemoveToStringInStringTemplate.html)

## Changelog:

[INTERNAL] - Kotlin: fix static code analysis weak warnings (4/n)

Pull Request resolved: https://github.com/facebook/react-native/pull/52207

Test Plan:
```sh
yarn android
yarn test-android
```

Reviewed By: javache

Differential Revision: D77209873

Pulled By: cortinico

fbshipit-source-id: 2bf5fcf7dcbf02632e721aab0688f73d15f220b9