refactor(magnification): Renaming IWindowMagnificationConnectionCallback as...

refactor(magnification): Renaming IWindowMagnificationConnectionCallback as IMagnificationConnectionCallback

Considering the connection callback is handling functions more than window magnification operations, we would like to rename it as IMagnificationConnectionCallback.

Bug: 310109308
Test: manually. Renaming the class and methods
      atest IMagnificationConnectionTest
      atest MagnificationConnectionManagerTest
      atest MagnificationConnectionWrapperTest
Flag: NA
Change-Id: Ic2e17dcb40602b97e07c5491f668ae6815240dd9