sdk-core: remove file attachments [INT-355]

Author: perf2711

packages/sdk-core/src/model/attachment/BacktraceFileAttachment.ts

@@ -1,4 +1,3 @@
 export * from './BacktraceAttachment.js';
-export * from './BacktraceFileAttachment.js';
 export * from './BacktraceStringAttachment.js';
 export * from './BacktraceUint8ArrayAttachment.js';