Catch exceptions when log not found for retried PRs and failed jobs

[mabartos]

• Closes Cannot update data via CI #58
• Fix update-data CI failing when gh run view --log-failed returns a non-zero exit code (missing/expired job logs)
• Catch exception and collect warnings instead of aborting the entire update
• No data loss - only the raw log output is skipped

Reproducer and fixed locally:

[INFO] --- exec:3.1.0:java (default-cli) @ dashboard ---
Fetching areas: .
Fetching updated issues since 2026-07-10: .
Fetching issues: .
Fetching updated prs since 2026-07-10: .
Fetching bugs with PRs: .
Updating pull request wait times since 2026-07-10: .
Fetching failed-jobs: 
Deleting expired failed-jobs: 
Fetching retried-prs: ...
[WARN] Failed to download log for run 29024314313: Returned with 1, see ghcli-err.log for details
Deleting expired retried-prs: 
Fetching workflow-status: ...
Loading cve stats: .......
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------

@ahus1 @stianst Can you check it? Thanks!