fix: Check uploaded file size in widget and dashboard (#1975)

* File size check logic in widget

* set maxium file size

* update locale texts

* file size check in dashboard

* dynamincally set file size limit error message

* code climate review fixes

* add alert mixin

* move attahcment bus event to constants

* Move file size check logic to helper

* add specs for file size limit check helper

* changes as per review

app/javascript/shared/helpers/specs/FileHelper.spec.js

@@ -0,0 +1,38 @@
+import {
+  formatBytes,
+  fileSizeInMegaBytes,
+  checkFileSizeLimit,
+} from '../FileHelper';
+
+describe('#File Helpers', () => {
+  describe('formatBytes', () => {
+    it('should return zero bytes if 0 is passed', () => {
+      expect(formatBytes(0)).toBe('0 Bytes');
+    });
+    it('should return in bytes if 1000 is passed', () => {
+      expect(formatBytes(1000)).toBe('1000 Bytes');
+    });
+    it('should return in KB if 100000 is passed', () => {
+      expect(formatBytes(10000)).toBe('9.77 KB');
+    });
+    it('should return in MB if 10000000 is passed', () => {
+      expect(formatBytes(10000000)).toBe('9.54 MB');
+    });
+  });
+  describe('fileSizeInMegaBytes', () => {
+    it('should return zero if 0 is passed', () => {
+      expect(fileSizeInMegaBytes(0)).toBe(0);
+    });
+    it('should return 19.07 if 20000000 is passed', () => {
+      expect(fileSizeInMegaBytes(20000000)).toBe('19.07');
+    });
+  });
+  describe('checkFileSizeLimit', () => {
+    it('should return false if file with size 62208194 and file size limit 40 are passed', () => {
+      expect(checkFileSizeLimit({ file: { size: 62208194 } }, 40)).toBe(false);
+    });
+    it('should return true if file with size 62208194 and file size limit 40 are passed', () => {
+      expect(checkFileSizeLimit({ file: { size: 199154 } }, 40)).toBe(true);
+    });
+  });
+});