fix(build): save assets and scenes before BuildPlayer

[TeapoyY]

Fixes #1341

Summary

• Call AssetDatabase.SaveAssets() and EditorSceneManager.SaveOpenScenes() in BuildRunner before BuildPipeline.BuildPlayer runs
• Prevents manage_build from blocking on Unity's unsaved-scene save dialog when scenes or assets were modified

Test plan

• Open a scene, modify it without saving, then run manage_build with action build
• Confirm the build starts without a save popup
• Confirm assets with unsaved changes are persisted before the build completes

[coderabbitai]

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