Use nodejs native support for env variables

### Problem description

We are using `dotenv` package through out the repo enable support for the env files.

### Solution description

Starting version 20, NodeJS have builtin support for env files with flag [--env-file](https://nodejs.org/api/cli.html#--env-fileconfig). So we should use this instead of the `dotenv` package.

### Additional context

This is yet an experimental feature but seems table now. We may wait for next minor releae for NodeJS untill 22.x and use this feature.