test: Remove attachAllThreads from undocumented options list (#7776)

The option is now documented in sentry-docs.

Author: itaybre

Tests/SentryTests/OptionsInSyncWithDocs/SentryOptionsDocumentationSyncTests.swift

@@ -41,9 +41,7 @@ final class SentryOptionsDocumentationSyncTests: XCTestCase {
         options.insert("profiling") // @_spi(Private) - internal backing for configureProfiling
         options.insert("configureProfiling")
         #endif
-        
-        options.insert("attachAllThreads") // SDK not released yet
-        
+
         return options
     }