[Build] Keep Windows installs free of build-tree artifacts

Several Windows packaging gaps could leak Visual Studio CMake build
output into the installed application or the NSIS installer:

- The per-app DLL sweep used
  ${CMAKE_BINARY_DIR}/${PROJECT_NAME}/${CMAKE_BUILD_TYPE}, which is
  empty on multi-config generators, collapsing the recursive
  DIRECTORY install into the whole build tree (containing *.dir,
  *_autogen, .qt, .qsb, x64, ...). Point it at the real per-config
  output with $<TARGET_FILE_DIR:...> and exclude build artifacts.
- install(FILES ${OPENSSL_INCLUDE_DIRS} ...) tried to install OpenSSL
  include directories as files. CMake refuses this
  ("install FILES given directory"); it only slipped through CI
  because the vcpkg OpenSSL config leaves the variable empty. Remove it;
  fixup_bundle already ships the OpenSSL runtime DLLs.
- The NSIS uninstaller only deleted *.exe/*.dll and a few known files,
  so build-tree leftovers survived an uninstall/reinstall cycle. Wipe
  the whole directory tree instead.
- Add a Windows CI gate that lists the packaged installer with 7-Zip
  and fails the build if any build-tree artifact path is found.

cmake/NSIS.template.in

@@ -387,19 +387,14 @@ SectionEnd
 
 Section "un.Application" UnSecApplication
 	SetShellVarContext all
-	RMDir /r "$INSTDIR\plugins"
-	RMDir /r "$INSTDIR\sounds"
-	RMDir /r "$INSTDIR\themes"
-	RMDir /r "$INSTDIR\translations"
-	Delete "$INSTDIR\*.exe"
-	Delete "$INSTDIR\*.dll"
-	Delete "$INSTDIR\qt.conf"
-	Delete "$INSTDIR\qdebug.txt"
-	Delete "$INSTDIR\servatrice.sql"
-	Delete "$INSTDIR\servatrice.ini.example"
-	RMDir "$INSTDIR"
 
-	RMDir "$SMPROGRAMS\Cockatrice"
+	; Remove the entire application directory so any file that is not part of
+	; the installed payload (e.g. build-tree artifacts such as *.dir folders,
+	; *_autogen and *.tlog files from a build) cannot survive between an
+	; uninstall and a fresh reinstall.
+	RMDir /r "$INSTDIR"
+
+	RMDir /r "$SMPROGRAMS\Cockatrice"
 
 	DeleteRegKey HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\Cockatrice"
 SectionEnd