fix(evaluation): SIL AzureML validation submission has broken code path and script reference

[katriendg]

Component

evaluation/sil/scripts/submit-azureml-validation.sh

Issue Description

The SIL evaluation AzureML submission script has the same class of bugs fixed for RL training in #320 / PR #372:

1. Entire repo uploaded as code snapshot — Line 168 sets code_path="$REPO_ROOT", uploading the full repository instead of a narrow snapshot.

2. Command references a non-existent script path — Line 271 uses command=bash training/scripts/validate.sh $cmd, but no file exists at that path. The actual validation script is at evaluation/sil/validate.sh.

Any attempt to run SIL validation via AzureML will fail with exit code 127 (No such file or directory), identical to the RL training failure described in #320.

Expected Behavior

• The code snapshot should be scoped to only the directories needed for validation
• The command should reference the correct script path relative to the snapshot root

Discovered During

PR #372 review — the RL training fix applied the same pattern corrections but the evaluation script was not updated.