KRACOEUS-7604 : Project Income Integrate Mockview -- move view from mock to to budget income

Seems to me the mockviews intentionally being kept in mock dir, so while I  moved  ProposalBudgetIncomePage.xml in to budget income and made some minor changes there. The original mockview is kept without touching.

This commit basically just to move mockview, it has long way to go to make budget project income page work for pd.  I am still learning.