chore: migrate connector to AirSync SDK v2

[radovanjorgic]

Description

Migrates the template connector from AirSync SDK v1 (@devrev/ts-adaas 1.20.0) to the v2 beta (@devrev/airsync-sdk 2.0.0-beta.6), applying the SDK's MIGRATION.md end-to-end via the migrate-to-sdk-v2 skill: package rename, the emit() → return TaskResult model, the extraction/loading worker split, phase-aware onTimeout handling, and axios/state adjustments. See MIGRATION_REVIEW.md for the per-section confidence notes on the parts that needed a second look.

Connected Issues

https://app.devrev.ai/devrev/works/ISS-351687

Checklist

• Tests added/updated and ran with npm run test OR no tests needed.
• Code formatted and checked with npm run lint.
• Added "How to test" section to the description OR this section is not needed.

How to test

1. cd code && npm install
2. npx tsc --noEmit && npm run lint && npm run build — all green.
3. Deploy and run a sync as usual; verify extraction/loading behave as before (no jest suite in this connector).