Added mockito library in the pom.xml

GCP-10042

Reviewer: Cy Casada
Remove commented codes, organized imports and Log exceptions

GCP-10042

Reviewer: Cy Casada
Added a new function for downloading a file that can be called by different UI components

GCP-10042

Reviewer: Cy Casada
Add unit tests for the Util.java function showExportExcelDownloadFile

GCP-10042

Reviewer: Cy Casada
Change the code to call the new filedownload utility in the Util.class, so instead of adding a new window, we just open a url so it can prompt the user for download of the file

GCP-10042

Reviewer: Cy Casada
Remove the empty constructor, not needed since the unit testing is focused on another class

GCP-10042

Reviewer: Cy Casada
Remove unused import

GCP-10042

Reviewer: Cy Casada