UI Test Automation (#39777)

### Summary

This pull request includes the following updates:

1. Improvements and stabilization of the UI automation framework  
2. Setup of the UI automation pipeline  
3. Add UI test cases for FancyZones  
4. Add UI test cases for MouseUtils  
5. Improvements of Hosts Editor UI tests

---

### Related Links

- **Current Release checklist coverage**:  
 
https://github.com/microsoft/PowerToys/blob/feature/UITestAutomation/src/common/UITestAutomation/Doc/ui-automation-cover-list.md

- **UI Automation pipeline**:  
 
https://microsoft.visualstudio.com/Dart/_build?definitionId=161438&_a=summary

---------

Signed-off-by: Shawn Yuan <shuai.yuan.zju@gmail.com>
Signed-off-by: Shawn Yuan <shuaiyuan@microsoft.com>
Co-authored-by: Jerry Xu <n.xu@outlook.com>
Co-authored-by: Zhaopeng Wang <zhaopengwang@microsoft.com>
Co-authored-by: Xiaofeng Wang (from Dev Box) <xiaofengwang@microsoft.com>
Co-authored-by: Mengyuan <162882040+chenmy77@users.noreply.github.com>
Co-authored-by: yaqingmi <miyaqing01@gmail.com>
Co-authored-by: Clint Rutkas <clint@rutkas.com>
Co-authored-by: Yaqing Mi (from Dev Box) <yaqingmi@microsoft.com>
Co-authored-by: Kai Tao <69313318+vanzue@users.noreply.github.com>
Co-authored-by: zhaopeng wang <33367956+wang563681252@users.noreply.github.com>
Co-authored-by: Laszlo Nemeth <57342539+donlaci@users.noreply.github.com>
Co-authored-by: RokyZevon <12629919+RokyZevon@users.noreply.github.com>
Co-authored-by: Yu Leng <42196638+moooyo@users.noreply.github.com>
Co-authored-by: Yu Leng (from Dev Box) <yuleng@microsoft.com>
Co-authored-by: Davide Giacometti <25966642+davidegiacometti@users.noreply.github.com>
Co-authored-by: Gordon Lam <73506701+yeelam-gordon@users.noreply.github.com>
Co-authored-by: ruslanlap <106077551+ruslanlap@users.noreply.github.com>
Co-authored-by: Muhammad Danish <mdanishkhdev@gmail.com>
Co-authored-by: Bennett Blodinger <benwa@users.noreply.github.com>
Co-authored-by: Jaime Bernardo <jaime@janeasystems.com>
Co-authored-by: Ionuț Manța <ionut@janeasystems.com>
Co-authored-by: Hao Liu <liuhaobupt@163.com>
Co-authored-by: OlegHarchevkin <40352094+OlegKharchevkin@users.noreply.github.com>
Co-authored-by: dcog989 <89043002+dcog989@users.noreply.github.com>
Co-authored-by: PesBandi <127593627+PesBandi@users.noreply.github.com>
Co-authored-by: Stefan Markovic <57057282+stefansjfw@users.noreply.github.com>
Co-authored-by: vanzue <vanzue@outlook.com>
Co-authored-by: Typpi <20943337+Nick2bad4u@users.noreply.github.com>
Co-authored-by: Mike Griese <migrie@microsoft.com>
Co-authored-by: Carlos Zamora <carlos.zamora@microsoft.com>
Co-authored-by: Abhyudit <64366765+bitmap4@users.noreply.github.com>
Co-authored-by: Heiko <61519853+htcfreek@users.noreply.github.com>
Co-authored-by: Ved Nig <vednig12@outlook.com>
Co-authored-by: Niels Laute <niels.laute@live.nl>
Co-authored-by: Aung Khaing Khant <aungkhaingkhant.dev@gmail.com>
Co-authored-by: Aung Khaing Khant <aungkhaingkhant@advent-soft.com>
Co-authored-by: Dustin L. Howett <duhowett@microsoft.com>
Co-authored-by: leileizhang <leilzh@microsoft.com>
Co-authored-by: Dustin L. Howett <dustin@howett.net>
Co-authored-by: Shawn Yuan <128874481+shuaiyuanxx@users.noreply.github.com>
Co-authored-by: Shawn Yuan <shuai.yuan.zju@gmail.com>
Co-authored-by: cryolithic <cryolithic@gmail.com>
Co-authored-by: Lemonyte <49930425+lemonyte@users.noreply.github.com>
Co-authored-by: Gordon Lam (SH) <yeelam@microsoft.com>
Co-authored-by: Corey Hayward <72159232+CoreyHayward@users.noreply.github.com>
Co-authored-by: Jerry Xu <nxu@microsoft.com>
Co-authored-by: Shawn Yuan <shuaiyuan@microsoft.com>
Co-authored-by: Kayla Cinnamon <cinnamon@microsoft.com>
Co-authored-by: Jeremy Sinclair <4016293+snickler@users.noreply.github.com>

.github/actions/spell-check/expect.txt

@@ -192,6 +192,7 @@ CImage
 cla
 CLASSDC
 CLASSNOTAVAILABLE
+cleanmgr
 clickable
 clickonce
 CLIENTEDGE
@@ -276,6 +277,7 @@ currentculture
 CURRENTDIR
 CURSORINFO
 cursorpos
+CURSORSHOWING
 customaction
 CUSTOMACTIONTEST
 CUSTOMFORMATPLACEHOLDER
@@ -343,7 +345,9 @@ DESELECTOTHERS
 DESIGNINFO
 DESKTOPABSOLUTEEDITING
 DESKTOPABSOLUTEPARSING
+DESKTOPHORZRES
 desktopshorcutinstalled
+DESKTOPVERTRES
 devblogs
 devdocs
 devmgmt
@@ -354,6 +358,7 @@ DFX
 DIALOGEX
 digicert
 dimm
+DINORMAL
 DISABLEASACTIONKEY
 DISABLENOSCROLL
 diskmgmt
@@ -397,6 +402,7 @@ DVASPECTINFO
 DVD
 dvr
 DVTARGETDEVICE
+dwflags
 dwl
 dwm
 dwmapi
@@ -485,6 +491,7 @@ FANCYZONESDRAWLAYOUTTEST
 FANCYZONESEDITOR
 FARPROC
 fff
+FFFF
 FILEEXPLORER
 FILEFLAGS
 FILEFLAGSMASK
@@ -603,6 +610,7 @@ helptext
 HGFE
 hglobal
 hhk
+HHmmssfff
 hhx
 Hiber
 Hiberboot
@@ -611,6 +619,7 @@ hicon
 HIDEREADONLY
 HIDEWINDOW
 Hif
+hightlight
 HIMAGELIST
 himl
 hinst
@@ -745,6 +754,7 @@ isocpp
 iss
 issecret
 ISSEPARATOR
+istep
 ith
 ITHUMBNAIL
 IUI
@@ -1275,6 +1285,7 @@ prvpane
 psapi
 pscid
 PSECURITY
+psexec
 psfgao
 psfi
 PSMODULEPATH
@@ -1532,6 +1543,7 @@ SLGP
 sln
 SMALLICON
 smartphone
+smileys
 SMTO
 SNAPPROCESS
 snk
@@ -1876,6 +1888,7 @@ WINDOWPOSCHANGING
 WINDOWSBUILDNUMBER
 windowssearch
 windowssettings
+windowsterminal
 WINDOWSTYLES
 WINDOWSTYLESICON
 winerror
@@ -1985,6 +1998,7 @@ Zoneszonabletester
 Zoomin
 zoomit
 ZOOMITX
+Zorder
 ZXk
 ZXNs
 zzz