chore(cross checker): Cross The Checker (matter-labs#856)

## What ❔

This PR removes the cross checker binary and all its references.

## Why ❔

The checker's scope is covered by other components.

## Checklist

<!-- Check your PR fulfills the following items. -->
<!-- For draft PRs check the boxes as you complete them. -->

- [x] PR title corresponds to the body of PR (we generate changelog
entries from PRs).
- [x] Tests for the changes have been added / updated.
- [ ] Documentation comments have been added / updated.
- [x] Code has been formatted via `zk fmt` and `zk lint`.
- [ ] Spellcheck has been run via `zk spellcheck`.

.github/workflows/build-core-template.yml

@@ -30,7 +30,6 @@ jobs:
             - server-v2
             - external-node
             - contract-verifier
-            - cross-external-nodes-checker
             - snapshots-creator
           platforms:
             - linux/amd64
@@ -109,8 +108,6 @@ jobs:
             platform: linux/amd64,linux/arm64
           - name: contract-verifier
             platform: linux/amd64
-          - name: cross-external-nodes-checker
-            platform: linux/amd64
           - name: snapshots-creator
             platform: linux/amd64
     env:

.github/workflows/ci-core-reusable.yml

@@ -317,9 +317,6 @@ jobs:
       - name: Integration tests
         run: ci_run zk test i server --testPathIgnorePatterns 'contract-verification|custom-erc20-bridge|snapshots-creator'
 
-      - name: Run Cross EN Checker
-        run: ci_run zk run cross-en-checker
-
       - name: Run revert test
         run: |
           ci_run zk env

.github/workflows/ci.yml

@@ -49,7 +49,6 @@ jobs:
               - 'core/**'
               - '!core/CHANGELOG.md'
               - 'docker/contract-verifier/**'
-              - 'docker/cross-external-nodes-checker/**'
               - 'docker/external-node/**'
               - 'docker/server/**'
               - '.github/workflows/build-core-template.yml'

Cargo.toml

@@ -43,7 +43,6 @@ members = [
 
     # Test infrastructure
     "core/tests/test_account",
-    "core/tests/cross_external_nodes_checker",
     "core/tests/loadnext",
     "core/tests/vm-benchmark",
     "core/tests/vm-benchmark/harness",