fix: 'SentryFileManager+Test.h' file not found (#3950)

* Update SentryTracer.m

* Update CHANGELOG.md

Author: brustolin

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+### Fixes
+
+- 'SentryFileManager+Test.h' file not found (#3950)
+
 ## 8.25.1
 
 ### Features

Sources/Sentry/SentryTracer.m

@@ -50,11 +50,6 @@
 #    import <SentryScreenFrames.h>
 #endif // SENTRY_HAS_UIKIT
 
-#if defined(TEST) || defined(TESTCI) || defined(DEBUG)
-#    import "SentryFileManager+Test.h"
-#    import "SentryInternalDefines.h"
-#endif // defined(TEST) || defined(TESTCI) || defined(DEBUG)
-
 NS_ASSUME_NONNULL_BEGIN
 
 static const void *spanTimestampObserver = &spanTimestampObserver;