[DW] Remove task from desktop tiling when it's minimized

A desktop tiling task is moving to front while being minimize
unintentionally because moveTiledPairToFront is called by focus changed
event. Therefore, remove task from desktop tiling before start minimize
like close button.

Bug: 391474641
Test: Tiling > Minimize Button > Should be minimized
Flag: com.android.window.flags.enable_tile_resizing
(cherry picked from https://partner-android-review.googlesource.com/q/commit:933387b7f7859b0350c8183ce6cf25454ccaeb8c)
Merged-In: Ib97666b0e769acf74de7b017b1f329f51500e81a
Change-Id: Ib97666b0e769acf74de7b017b1f329f51500e81a