7571: do not activate terminal window upon settings modificaion (#7887)

Took this as an easy starter. The method IslandWindow::SetAlwaysOnTop is
triggered once terminal settings are reloaded (in
TerminalPage::_RefreshUIForSettingsReload flow). This method calls
SetWindowPos without SWP_NOACTIVATE. As a result the window gets
activated, the focus is set and the cursor starts blinking.

Added SWP_NOACTIVATE in all SetWindowPos calls from IslandWindow and
NoClientIslandWindow (where it was missing). Please let me know if this
is an overkill - it is not required to fix the issue, however seems a
good practice, that might help if we decide to apply more settings
immediately.

## Validation Steps Performed
* Only manual testing - please guide me to the relevant UT framework, if
  exists. 
* Trying to reproduce this with VS attached doesn't work - the window
  gets the focus in any case.
* Tested as a standalone application, by modifying different settings
  (and comparing the results before and after the fix).
* Checked with Spy++ that no WM_ACTIVATE / WM_SETFOCUS is thrown upon
  settings modification
* Applied terminal resizing, toggling full screen and focus mode to
  check no regression was introduced.

Closes #7571

src/cascadia/WindowsTerminal/IslandWindow.cpp

@@ -263,7 +263,7 @@ void IslandWindow::Initialize()
 void IslandWindow::OnSize(const UINT width, const UINT height)
 {
     // update the interop window size
-    SetWindowPos(_interopWindowHandle, nullptr, 0, 0, width, height, SWP_SHOWWINDOW);
+    SetWindowPos(_interopWindowHandle, nullptr, 0, 0, width, height, SWP_SHOWWINDOW | SWP_NOACTIVATE);
 
     if (_rootGrid)
     {
@@ -499,7 +499,7 @@ void IslandWindow::SetAlwaysOnTop(const bool alwaysOnTop)
                      0,
                      0,
                      0,
-                     SWP_NOMOVE | SWP_NOSIZE);
+                     SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);
     }
 }
 
@@ -613,7 +613,7 @@ void IslandWindow::_SetIsBorderless(const bool borderlessEnabled)
                  windowPos.top<int>(),
                  windowPos.width<int>(),
                  windowPos.height<int>(),
-                 SWP_SHOWWINDOW | SWP_FRAMECHANGED);
+                 SWP_SHOWWINDOW | SWP_FRAMECHANGED | SWP_NOACTIVATE);
 }
 
 // Method Description:
@@ -699,7 +699,7 @@ void IslandWindow::_ApplyWindowSize()
                                          newSize.top,
                                          newSize.right - newSize.left,
                                          newSize.bottom - newSize.top,
-                                         SWP_FRAMECHANGED));
+                                         SWP_FRAMECHANGED | SWP_NOACTIVATE));
 }
 
 DEFINE_EVENT(IslandWindow, DragRegionClicked, _DragRegionClickedHandlers, winrt::delegate<>);

src/cascadia/WindowsTerminal/NonClientIslandWindow.cpp

@@ -370,7 +370,7 @@ void NonClientIslandWindow::_UpdateIslandPosition(const UINT windowWidth, const
                                    newIslandPos.Y,
                                    windowWidth,
                                    windowHeight - topBorderHeight,
-                                   SWP_SHOWWINDOW));
+                                   SWP_SHOWWINDOW | SWP_NOACTIVATE));
 
     // This happens when we go from maximized to restored or the opposite
     // because topBorderHeight changes.
@@ -849,7 +849,7 @@ void NonClientIslandWindow::_SetIsBorderless(const bool borderlessEnabled)
                  windowPos.top<int>(),
                  windowPos.width<int>(),
                  windowPos.height<int>(),
-                 SWP_SHOWWINDOW | SWP_FRAMECHANGED);
+                 SWP_SHOWWINDOW | SWP_FRAMECHANGED | SWP_NOACTIVATE);
 }
 
 // Method Description: