feat: add option to export xpress proposals

[deepaksftc]

Description

This PR introduces a feature that allows users to export Xpress proposals.

Motivation and Context

The need for this feature arose from the necessity to provide users with a way to export proposal data for offline usage and further analysis. This feature enhances the usability of the platform and provides additional value to our users.

Changes

• Added an option to export Xpress proposals in the DownloadService.ts file.
• Implemented the collection of proposal data for XLSX export in the proposal.ts file.
• Created a new route in the xlsx.ts file to handle the export of the collected data.
• Added e2e tests in the xpress.cy.ts file to ensure the feature works as expected.
• Updated the frontend XpressProposalTable.tsx file to include the export option in the UI.

How Has This Been Tested

In addition to the unit tests that have been added, this feature has been manually tested to ensure its correct functionality. The e2e tests added in xpress.cy.ts confirm that an officer and a scientist can export proposals into Excel. The exported file was then manually inspected to ensure all data is present and correctly formatted.

How Has This Been Tested?

Fixes Issue

UserOfficeProject/issue-tracker#1028
UserOfficeProject/issue-tracker#1205

Depends On

Tests included/Docs Updated?

• I have added tests to cover my changes.
• All relevant doc has been updated