fix: improve file upload handling in prepare-request to use streaming (#5637)

* fix: improve file upload handling in prepare-request to use streaming
* feat: add unit tests

---------

Co-authored-by: Bijin Bruno <bijin@usebruno.com>

packages/bruno-cli/tests/utils/filesystem.spec.js

@@ -0,0 +1,50 @@
+const { isLargeFile } = require('../../src/utils/filesystem');
+const fs = require('fs-extra');
+
+describe('isLargeFile', () => {
+  let existsSyncSpy;
+  let lstatSyncSpy;
+  let statSyncSpy;
+
+  beforeEach(() => {
+    existsSyncSpy = jest.spyOn(fs, 'existsSync');
+    lstatSyncSpy = jest.spyOn(fs, 'lstatSync');
+    statSyncSpy = jest.spyOn(fs, 'statSync');
+  });
+
+  afterEach(() => {
+    jest.restoreAllMocks();
+  });
+
+  it('should return false when file size is below default threshold (10MB)', () => {
+    existsSyncSpy.mockReturnValue(true);
+    lstatSyncSpy.mockReturnValue({ isFile: () => true });
+    statSyncSpy.mockReturnValue({ size: 5 * 1024 * 1024 }); // 5MB
+
+    expect(isLargeFile('/path/small.bin')).toBe(false);
+  });
+
+  it('should return true when file size is above default threshold (10MB)', () => {
+    existsSyncSpy.mockReturnValue(true);
+    lstatSyncSpy.mockReturnValue({ isFile: () => true });
+    statSyncSpy.mockReturnValue({ size: 15 * 1024 * 1024 }); // 15MB
+
+    expect(isLargeFile('/path/large.bin')).toBe(true);
+  });
+
+  it('should respect custom threshold (args true or false)', () => {
+    existsSyncSpy.mockReturnValue(true);
+    lstatSyncSpy.mockReturnValue({ isFile: () => true });
+    statSyncSpy.mockReturnValue({ size: 50 });
+
+    expect(isLargeFile('/path/file.bin', 100)).toBe(false); // 50 < 100
+    expect(isLargeFile('/path/file.bin', 10)).toBe(true); // 50 > 10
+  });
+
+  it('should throw on invalid values (not a file)', () => {
+    existsSyncSpy.mockReturnValue(false);
+    lstatSyncSpy.mockReturnValue({ isFile: () => false });
+
+    expect(() => isLargeFile('/path/not-a-file.bin')).toThrow('File /path/not-a-file.bin is not a file');
+  });
+});