Use a minimal binary to fetch grammar sources in release CI (#2557)

This is an optimization for the release CI. The release CI can take
a while since it compiles release builds for all operating systems.
We cut down on duplicate work and overall time by fetching
tree-sitter grammar repositories and then using those repositories
in all later steps. Previously we built all of helix just to run

    helix_loader::grammar::fetch_grammars()

which is wasteful on time. With this change we only build the
helix-loader crate.

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