ci: upgrade Claude orchestrator to v2.1.0 — graceful API unavailability skip

[sfreudenthaler]

Summary

• Bump ai-workflows reference from v2.0.0 → v2.1.0 in ai_claude-orchestrator.yml
• v2.1.0 adds pre-flight Anthropic API availability check + runtime error triage

Problem

When the Claude service has an outage, all PR pipelines fail with:

API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"}} · check status.claude.com

Example blocked run: https://github.com/dotCMS/core/actions/runs/24461196854

What changed in v2.1.0 (ai-workflows)

Pre-flight check (Layer 1):

• Calls GET /v1/models before running claude-code-action (15s timeout, 2 retries)
• 5xx or network failure → available=false → skip Claude step gracefully with ::warning::
• 401/403/429 or other codes → proceed so the action surfaces the specific error

Runtime protection (Layer 2):

• continue-on-error: true on the Claude step
• Post-execution step re-checks the API if Claude failed
• API available after failure → re-fail the job ("legitimate error")
• API unavailable after failure → skip gracefully ("service degradation")

Test

Validated in dotCMS#460 (also updated to v2.1.0):

• Pre-flight check correctly identifies API availability
• Legitimate errors still surface and fail the job (correct)
• Service outage path is code-correct (pre-flight would skip before Claude runs)

Fixes #35328