Realm keeps deleting symbol files
This is caused by an issue with how BCSymbolMap files are handled in Realm's strip-frameworks.sh script, which was recently fixed in #3032, but hasn't yet been included in an official release. The next release of Realm will include the fix.
What is .symbol files in IPA
Yes, it is debug symbols. They contain a mapping between encoded names and locations in your compiled code and the original function names among other debug information. Each <UUID>.symbols file represents either the main binary of you app or a framework that your app is using. You can find out which is which using mdfind (see example).
See this about symbolication
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