ci(spellcheck): migrate to cspell

[DariuszPorowski]

Migrate to cspell and standardize config with radius core repo: https://github.com/radius-project/radius/blob/main/.github/workflows/spellcheck.yaml

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

OpenSSF Scorecard

Package	Version	Score	Details
actions/actions/setup-node	48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e	🟢 5.7	Details Check Score Reason Maintained 🟢 6 8 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 6 Code-Review 🟢 10 all changesets reviewed Binary-Artifacts 🟢 9 binaries present in source code Dangerous-Workflow 🟢 10 no dangerous workflow patterns detected Packaging ⚠️ -1 packaging workflow not detected Token-Permissions ⚠️ 0 detected GitHub workflow tokens with excessive permissions CII-Best-Practices ⚠️ 0 no effort to earn an OpenSSF best practices badge detected Pinned-Dependencies ⚠️ 0 dependency not pinned by hash detected -- score normalized to 0 Fuzzing ⚠️ 0 project is not fuzzed License 🟢 10 license file detected Signed-Releases ⚠️ -1 no releases found Security-Policy 🟢 9 security policy file detected Branch-Protection ⚠️ 1 branch protection is not maximal on development and all release branches SAST 🟢 9 SAST tool is not run on all commits -- score normalized to 9

Scanned Files

• .github/workflows/spellcheck.yaml

[github-actions]

Static Web App Preview

Environment	Deployment
pr1886	View workflow run

Deployed from commit 6767d26554fce2f36fb088452d17e783ad486aa5 via the publisher workflow.