Add Signed and Approved option to contract upload for staff and Contracting team

Fixes #3923

Test Steps

[ ] Login as Staff/Contracting team and upload contract.
[ ] There should be a Signed and Approved option.
[ ] On selecting signed and approved, the project should move directly to Invoicing and reporting.
[ ] Check the language in popup regarding Signed and Approved.
[ ] Check the tasks and project functionalities after signed and approved.
[ ] Check project or any notification shouldn't go to applicant regarding the contract.
[ ] Check everything working the same as before if no signed and approved is selected.