chore(compliance): archive legacy license-cla-check.yml

[aabusair]

Moves license-cla-check.yml into workflows/old/, which disables it (GitHub only scans .github/workflows/*.yml directly, not subdirectories).

Confirmed dead before archiving:

• Only exists in vmware/.github (org-wide code search returned 1 file) — its pull_request_target/issue_comment/pull_request triggers only ever fired on PRs against this repo, never any other repo in the org.
• Its cla-gate job (contributor-assistant/github-action, a separate CLA mechanism from the current policy_selector.py system, with its own document and signature store) is not referenced by any of the org's 4 Rulesets (active, evaluate, or disabled) — nothing requires it.
• Its own signature store path (signatures/version1/vmware/.github/cla.json) has never existed in this repo's git history — nobody has ever successfully signed through it.
• On a real recent PR (fix(compliance): remove duplicate PR-trigger from cla_sweeper.yml #59), cla-gate returned "failure" for an org member that the current system correctly bypassed — direct evidence it's stale, not just unused.
• The bundled license-check job (REUSE linter) only ever ran against this same single repo with no evidence of active reliance, so it's retired alongside cla-gate rather than split out.

[github-actions]

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