Update to Go 1.24, restrict file writes to the specified output directory for --multi#850
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This brings things more into line with modern conventions for build target names, and means we have fewer sources of truth for the minimum Go version that's needed.
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Restricting file writes, for #527.
This relies on the
os.Rootfunctionality that was added to the Go standard library in 1.24: https://go.dev/doc/go1.24#directory-limited-filesystem-accessAlso it needs a few helper functions that can be removed once we update again to Go 1.25, which adds
Root.ReadFile,Root.WriteFile,Root.MkdirAll.Bumping the Go version requirement is actually a bit annoying, I'm not sure I've updated everything correctly (every time I have to touch Gazelle and the Bazel Go rules I have to re-learn how they work)