fix(ci): upgrade rust-e2e-large-kona-sequencer to 2xlarge resource class

[ajsutton]

Summary

Upgrade the rust-e2e-large-kona-sequencer CI job from xlarge (8 vCPU, 16GB) to 2xlarge (16 vCPU, 32GB) to fix a flaky TestSyncSafe failure.

Root Cause

The large-kona-sequencer devnet config spins up ~20+ processes: 9 L2 CL nodes (1 kona sequencer + 4 kona-reth validators + 4 kona-geth validators), 9 L2 EL nodes, plus L1, batcher, and supervisor. On xlarge, resource contention causes kona-node engine API calls to time out:

ERROR component=kona-node error="Request timeout"
ERROR component=kona-node error="ErrorObject { code: ServerError(13), message: \"Request timeout\", data: None }"
WARN  Failed to insert new payload: server returned an error response: error code 13: Request timeout

When payload insertions fail, the safe head can't advance, and TestSyncSafe exhausts its retry budget (80 attempts * 2s = 160s) with:

operation failed permanently after 80 attempts: expected head to advance: local-safe

This failure was previously invisible at the test level because the rust-e2e jobs didn't report JUnit XML results to CircleCI. It showed up only as a job-level failure. #19548 adds store_test_results to make these visible.

Change

Added a resource_class parameter to rust-e2e-sysgo-tests (defaults to xlarge so existing variants are unchanged) and split large-kona-sequencer out of the matrix with resource_class: 2xlarge.

Test plan

• rust-e2e-large-kona-sequencer passes on 2xlarge
• Other rust-e2e variants unaffected (still xlarge)

🤖 Generated with Claude Code

[theochap]

Let's also reduce the number of validator nodes in the large kona sequencer preset

[ajsutton]

Claude: Closing in favor of removing the variant entirely. It runs the same tests as simple-kona-sequencer with the same logic — just more nodes iterating the same slices. The extra coverage isn't meaningful enough to justify 2xlarge or the flake risk.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.5%. Comparing base (1e2b976) to head (1aad2d7).
⚠️ Report is 4 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #19552     +/-   ##
==========================================
- Coverage     75.5%    75.5%   -0.1%     
==========================================
  Files          675      675             
  Lines        71571    71571             
==========================================
- Hits         54079    54073      -6     
- Misses       17348    17354      +6     
  Partials       144      144             

Flag	Coverage Δ
cannon-go-tests-64	66.4% <ø> (ø)
contracts-bedrock-tests	80.2% <ø> (ø)
unit	75.5% <ø> (-0.1%)	⬇️

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see 5 files with indirect coverage changes

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