Improve test_alternatives.sh script

[paulmoon]

Improvements:

• Create functions for each DM/TF/KRM provisioning resources
• Don't require the user to login if we can detect that valid creds exist
• Colorize the success and failure messages
• Use only one project instead of requiring 3 different projects
• Clean up the resources after provisioning resources
• Fix a few bugs here and there, like
  • cp -R alternatives/krm should be cp -R alternatives/krm/, and same for Terraform
  • Add 60s timeout for waiting for PubSubSubscription
• Change deployment name from d1 to deployment to be slightly more descriptive

If this PR looks good, I'll make similar changes to the other existing test_alternatives.sh script. This should make future test_alternatives.sh script better.

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