chore: update legal message for addons:create and test

[k80bowman]

Work item

Description

Updates the legal message for ai:models:create to match the desired message (see internal work item). When a user runs ai:models:create, they should get this message:

Testing

Prepare your environment for testing

• Fetch this branch.
• Run yarn && yarn build.
• Set the HEROKU_INFERENCE_ADDON to the production canary add-on via export HEROKU_INFERENCE_ADDON="inference-staging"
• Create a test app: heroku apps:create test-cli-plugin-ai

Actual testing

• Run ./bin/run addons:create heroku-inference-staging:claude-3-5-sonnet -s test-cli-plugin-ai -t test-cli-plugin-ai to create a provisioned model.
• Check that the legal message printed matches the message in the work item.
  • NOTE: The message has been changed slightly to add links to online resources
• Delete the test app

[zwhitfield3]

Worked perfectly!