Refactor mt-sync-code.yml to match mt-build.yml structure with shared setup action

[Copilot]

• Analyze the current structure of mt-sync-code.yml and mt-build.yml
• Create separate MT-TEST-JOB and MT-LINT-JOB in mt-sync-code.yml
• Update MT-SYNC-CODE-JOB to depend on both test and lint jobs
• Move test_only.sh execution to MT-TEST-JOB
• Move lint_only.sh execution to MT-LINT-JOB
• Update artifact upload steps for each job appropriately
• Fix comments in lint job to accurately reflect context
• Rename job from MT-SYNC-CODE-DATA-JOB to MT-SYNC-CODE-JOB
• Refactor to use ./.github/actions/setup with code-sync: true input
• Add required environment variables (MT_BRANCH_NAME, MT_TARGET_BRANCH_NAME, MT_SHA)
• Remove duplicate setup steps now handled by the shared setup action
• Ensure the workflow continues to work correctly by validating the syntax

Summary

This PR refactors mt-sync-code.yml to match the structure of mt-build.yml by:

• Splitting test and lint execution into separate parallel jobs
• Using the shared ./.github/actions/setup action with code-sync: true to eliminate code duplication
• Centralizing setup logic (checkout submodules, code sync, code setup, JDK, Gradle) in the reusable action

The workflow maintains all original functionality including code synchronization and the assemble step in the main sync job, while being more maintainable and consistent with other workflows in the repository.

Original prompt

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This section details on the original issue you should resolve

<issue_title>CI > .github/workflows/mt-sync-code.yml should split test_only.sh and lint_only.sh in different jobs like .github/workflows/mt-build.yml</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes CI > .github/workflows/mt-sync-code.yml should split test_only.sh and lint_only.sh in different jobs like .github/workflows/mt-build.yml #94

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[mmathieum]

@copilot please look at .github/workflows/mt-build.yml and re-use ./.github/actions/setup. It's basically the same workflow but with code-sync inputs as true and without the ASSEMBLE job.

[Copilot]

Refactored to use ./.github/actions/setup with code-sync: true input in commit 01213c3. The workflow now matches the structure of mt-build.yml but with code-sync enabled and without the ASSEMBLE job (assemble is in the main sync job).