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Fix more encryption issues on exFAT filesystem (#7162)

* refactor file operations

* fix an issue on exFAT systems where the file unique id was not correct for new Realms leading to corruption for encrypted Realms

* fix the remaining callsites where a unique id could be reused

* add changelog note

* fix an error in the tests that would cause spawned processes to not have the same fallback tmp path which could cause issues if running on a filesystem that doesn't support mkfifo such as exFAT

* return none in an interprocess race on creating a lock file and getting its unique id

* Throw an exception on unique id failure instead of

asserting in consideration of external processes.
Use prealloc to size the file instead of a separate resize operation.
Add the file path to help debug exceptions.

* better error handling and cache a File unique id to catch more errors

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