build: Rework CI and move all bundling into new build target. (#6556)

* build: Rework CI and move all bundling into new build target.

* ci: Use "mingw" in msys2 release names for compatibility.

* ci: Use "osx" in macOS release names for compatibility.

* ci: Disable macOS upload.

Will be moved to a separate PR for canary merge.

.ci/windows.sh

@@ -0,0 +1,17 @@
+#!/bin/sh -ex
+
+mkdir build && cd build
+cmake .. -G Ninja \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_C_COMPILER_LAUNCHER=ccache \
+    -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
+    -DENABLE_QT_TRANSLATION=ON \
+    -DCITRA_ENABLE_COMPATIBILITY_REPORTING=ON \
+    -DENABLE_COMPATIBILITY_LIST_DOWNLOAD=ON \
+    -DUSE_DISCORD_PRESENCE=ON
+ninja
+ninja bundle
+
+ccache -s
+
+ctest -VV -C Release || echo "::error ::Test error occurred on Windows build"