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Ensure `bin/dist/anycable-go` has execution permission

Someone on my team ran into an issue where even though the `bin/dist/anycable-go` binary had been downloaded by `bin/anycable-go`, the binary
failed to have execution permission.

This resulted in `Permission denied` errors when running `bin/anycable-go`, and it wasn't immediately apparent for them to be able to debug the issue.

The download task does have an explicit step that sets the execution bit:
- https://github.com/anycable/anycable-rails/blob/e4dcb9312/lib/generators/anycable/download/download_generator.rb#L77-L79

For _some_ reason this failed in their case, and it made things difficult to debug.

By having `bin/anycable-go` check for execution permission before calling the binary we can avoid this unexpected edge-case.

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