Migrate JavaScript SDK CI tests to SAM

[ayushiahjolia]

• Migrate the test deployment mechanism from the custom script to SAM CLI (sam build + sam deploy).
• Validate for both Node 22.x and 24.x runtimes, clean up JS test functions from old resource and document if required.

[zhongkechen]

partially fixed by #704

[ayushiahjolia]

We need to update config for Dependabot PRs to run tests - #735