explicitly install node v16 + use npm ci + update package-lock.json

[mithunshanbhag]

Change Description:

1. Explicitly install node v16 on the CI machine (since UI code has dependency on v16 and not on v18 LTS).
2. Use 'npm ci' instead of 'npm install' to prevent updates to the package-lock.json file.
3. Use an updated & deduped version of package-lock.json file.