Add custom preview environment support #41131

Job	Run time
📊 Static checks / Code style, file formatting, and docs	35s
🤖 Android / Editor (target=editor)	6m 59s
🍏 iOS / Template (target=template_release)	1m 53s
🍎 macOS / Editor (target=editor, tests=yes)	5m 30s
🤖 Android / Template arm32 (target=template_release, arch=arm32)	3m 45s
🐧 Linux / Editor w/ Mono (target=editor)	7m 50s
🍎 macOS / Template (target=template_release, tests=yes)	3m 55s
🤖 Android / Template arm64 (target=template_release, arch=arm64)	3m 48s
🐧 Linux / Editor with doubles and GCC sanitizers (target=editor, tests=yes, dev_build=yes, scu_build=yes, precision=double, use_asan=yes, use_ubsan=yes, linker=gold)	8m 44s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	6m 46s
🌐 Web / Template w/o threads (target=template_release, threads=no)	7m 43s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	8m 38s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	8m 44s
🐧 Linux / Template w/ Mono (target=template_release, tests=yes)	1m 50s
🐧 Linux / Minimal template (target=template_release, tests=yes, everything disabled)	1m 21s
🏁 Windows / Editor (target=editor, tests=yes)	3m 1s
🏁 Windows / Editor w/ clang-cl (target=editor, tests=yes, use_llvm=yes)	7m 37s
🏁 Windows / Template (target=template_release, tests=yes)	8m 34s
🪲 Godot CPP	1s
	1h 37m 14s

Provide feedback