Improve "deploy.sh" script

[promisinganuj]

Improve the maindeploy.sh script to include the following:

DoD

• [ ] Create /scripts/verify_prerequisites.sh file to perform pre-validations. Refer verify_prerequisites.sh. Include the following:
  • [ ] Check python is installed.
  • [ ] Check python version is 3.9+.
  • [ ] Check "requests" library is available.
• [ ] Add environment variable validation
  • [ ] Abort if all the required variables are not set.