refactor: rewrite the way to load commit message from `$GIT_DIR` for … #4002

Job	Run time
Prepare version string	3s
Build / Build Windows x64	3m 51s
Build / Build Linux	3m 19s
Build / Build macOS (Intel)	3m 58s
Build / Build Linux (arm64)	3m 20s
Build / Build Windows ARM64	3m 54s
Build / Build macOS (Apple Silicon)	2m 33s
Package / Package macOS (osx-arm64)	15s
Package / Package Windows (win-x64)	23s
Package / Package Windows (win-arm64)	24s
Package / Package macOS (osx-x64)	20s
Package / Package Linux (linux-x64)	53s
Package / Package Linux (linux-arm64)	53s
	24m 6s

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