fix(security): sanitize clear-text logging in triage, scraper, git_ops

[menil]

Summary

Addresses CodeQL rule py/clear-text-logging-sensitive-data across 3 components:

• src/jobgitops/cli/triage.py: Omit raw apply_url parameter logging when URL validation fails to avoid logging sensitive query strings or unsafe inputs (JobGitOps-cgp).
• src/jobgitops/scraper.py: Log character length of issue_body in dry run mode instead of printing raw content snippet (JobGitOps-csc).
• src/jobgitops/git_ops.py: Apply redact_sensitive_string to original_error in _push_with_lease_retry to prevent accidental token/credential leakage (JobGitOps-dz3).

Verification

• just validate passed (all 542 unit tests, linter, formatting checks, and 95.25% test coverage).
• Closed Beads tasks: JobGitOps-cgp, JobGitOps-csc, JobGitOps-dz3.

[github-actions]

The changes are generally positive: git_ops.py adds redaction of sensitive error messages for better security, and scraper.py reduces exposure of issue bodies in dry-run mode. The triage.py change is a minor clarity improvement. No critical issues found.