Add kona, rollup-boost, op-rbuilder submodules for acceptance testing

[teddyknox]

Replace environment variable requirements (ROLLUP_BOOST_EXEC_PATH, OP_RBUILDER_EXEC_PATH, KONA_NODE_EXEC_PATH, KONA_SUPERVISOR_EXEC_PATH) with automatic binary discovery and optional JIT compilation.

Changes

op-devstack/sysgo:

• Add rust_binary.go with shared EnsureRustBinary() utility that locates Rust binaries using rustc and cargo metadata
• Update rollup_boost.go, op_rbuilder.go, l2_cl_kona.go, supervisor_kona.go to use the new utility
• Remove env var checks from system.go

Justfiles:

• Add build-debug targets to kona/justfile, op-rbuilder/justfile, rollup-boost/Justfile
• Add build-rust-debug to root justfile to build all Rust binaries
• Update op-acceptance-tests/justfile to build Rust binaries during local test setup

CI (.circleci/config.yml):

• Add rust-binaries-for-sysgo job to pre-build and cache binaries
• Add job as dependency for acceptance-tests and scheduled-flake-shake workflows

Behavior

• CI: Binaries are pre-built; missing binaries fail fast with a clear error
• Local: just acceptance-test builds binaries automatically, or set RUST_JIT_BUILD=1 for on-demand compilation during tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.48%. Comparing base (727890b) to head (05321c2).
⚠️ Report is 17 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #18540      +/-   ##
===========================================
- Coverage    75.78%   75.48%   -0.30%     
===========================================
  Files          189      189              
  Lines        11239    11239              
===========================================
- Hits          8517     8484      -33     
- Misses        2576     2611      +35     
+ Partials       146      144       -2     

Flag	Coverage Δ
cannon-go-tests-64	66.58% <ø> (-0.82%)	⬇️
contracts-bedrock-tests	80.46% <ø> (ø)

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see 5 files with indirect coverage changes

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[theochap]

Looks good a few comments. Approving to unblock