Changes

• Add .azdo/publish.yml — ESRP publish pipeline migrated from ADO
• Pipeline uses checkout: self instead of external repo checkout (removes dependency on personal GitHub service connection)
• Replaces boolean Publish + UseInternalFeed parameters with single publishType (Internal / Public) to match C# and PY pattern

publish.yml features

• Required publishType parameter to select internal vs public publish
• Single stage: install dependencies, build, test, stamp versions via nbgv, pack non-private packages, then conditionally publish
• Internal: publishes .tgz packages to Azure Artifacts TeamsSDKPreviews feed
• Public: signs and publishes to npm via ESRP
• Always resolves dependencies from internal feed (avoids 1ES pool firewall issues)
• Depends on nbgv versioning to differentiate between preview (next tag) and stable (latest tag) releases

Differences from PY/C# pipeline

• No ExcludePackageFolders — npm pack already skips private: true packages (PY needs it because uv build --all-packages builds everything)
• No PublishTestResults — Jest doesn't produce JUnit XML (PY uses pytest's --junitxml flag)
• No separate test dependency install step — test frameworks are installed by npm ci (PY installs pytest separately)
• Single parameterized pipeline for both preview and stable (C# has separate publish.yml and publish-preview.yaml)