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Before Go 1.21 we relied on third-party and custom tooling to manage which version of Go we were using for development, testing, and release builds. However, modern Go toolchains have built-in support for selecting an appropriate toolchain based on metadata in the go.mod file, and so we had previously removed most uses of the .go-version file and were maintaining it just as a remnant of the old state of things. This replaces our last remaining use of the ".go-version" file with a small tool that extracts the Go version from the go.mod file, and then removes the ".go-version" file completely. The "go" and "toolchain" directives in go.mod are now our single source of truth about which version of Go we're currently using for OpenTofu. (It may be possible to rework the Dockerfile for the consul backend to handle Go version selection in a different way so that we'd no longer need even this "selected-go-version" tool, but that's beyond the scope of this commit which aims to leave it unmodified to make sure the effective testing behavior for that backend is unchanged for now.) Signed-off-by: Martin Atkins <mart@degeneration.co.uk>