ci,scripts: install LLVM before cargo tools

[avi-starkware]

Reorder bootstrap and install_build_tools.sh so LLVM 19 is installed
before cargo tools. This is needed because install_cargo_tools.sh will
install starknet-native-compile which requires LLVM to build.

Safe change: LLVM installation does not depend on Rust.

Co-Authored-By: Claude Opus 4.6 (1M context) noreply@anthropic.com

---

Note

Medium Risk
Touches CI/build installation order; low code risk but can break developer/CI environments if the new sequencing has untested assumptions or OS-specific differences.

Overview
Reorders CI/bootstrap and local build tooling installation so scripts/dependencies.sh (LLVM 19 + related native deps) runs before install_cargo_tools.sh, ensuring cargo-installed tools that compile native code (e.g., starknet-native-compile) have LLVM available.

In the bootstrap composite action, setup_native_deps is now executed before installing Rust to match the updated dependency ordering.

^{Reviewed by Cursor Bugbot for commit 1efda68. Bugbot is set up for automated code reviews on this repo. Configure here.}

[reviewable-StarkWare]

This change is 

[avi-starkware]

• apollo_compilation_utils: remove dead install_compiler_binary and legacy paths #13676
• apollo_compile_to_casm,apollo_compile_to_native: switch to script-based compiler installation #13675
• ci,scripts: install LLVM before cargo tools #13674 👈 (View in Graphite)
• apollo_compilation_utils: add verify_compiler_binary #13673
• scripts: add install_compiler_binaries.sh #13672
• apollo_infra_utils,apollo_compile_to_native: add compiler version text files #13671
• main

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[dorimedini-starkware]

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[cursor]

PR Summary

Low Risk
Low risk ordering change in CI/scripts, but could affect build setup if dependencies.sh or native deps have hidden assumptions about Rust/toolchain state.

Overview
Updates the bootstrap composite action to install native Cairo/LLVM dependencies before installing Rust.

Adjusts scripts/install_build_tools.sh to run dependencies.sh (with clearer logging) prior to install_cargo_tools.sh, ensuring cargo-installed tools that compile native code have required system dependencies available.

^{Reviewed by Cursor Bugbot for commit cf03fe4. Bugbot is set up for automated code reviews on this repo. Configure here.}

[dorimedini-starkware]

@dorimedini-starkware reviewed 1 file and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on avi-starkware).