CTF gen docs, multi-don example by default

[skudasov]

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Below is a summarization created by an LLM (gpt-4-0125-preview). Be mindful of hallucinations and verify accuracy.

Why

The changes aim to enhance the developer environment and testing framework for Chainlink products, focusing on simplification, modularity, and automation. These changes encourage best practices in functional and non-functional testing, observability, and integration with third-party services, facilitating the development and quality assurance processes.

What

• framework/tmpl_gen_env.go
  • Revised and expanded the README template to provide a more focused guide on setting up the development environment, functional and non-functional testing, including observability and integration with third-party services.
  • Introduced a structured approach to functional and non-functional testing, including instructions on implementing tests and incorporating them into CI/CD pipelines.
  • Added guidance on working with "fakes" for third-party services, running multiple product instances, and adding more node sets (DONs), enhancing the environment's flexibility for various testing scenarios.
  • Updated Go module dependencies to reflect new versions.
  • Modified the Node image version in the environment configuration to use a newer version of Chainlink nodes.
  • Reframed testing commands in the CLI and completion templates to align with the new testing strategy (functional/non-functional).
  • Adjusted CI templates for functional and non-functional testing to reflect the updated testing approach.
• framework/tmpl_gen_product.go
  • Enhanced product configuration templates to include examples and guidelines for configuring Chainlink nodes, storing environment configurations, and implementing product-specific setups.
  • Provided examples for generating node configurations and secrets, emphasizing modularity and the ability to handle multiple blockchain and nodeset inputs.
  • Added Chainlink client usage examples within the product configuration to illustrate interaction with Chainlink nodes for job and contract setup.
• framework/tmpl_gen_test.go
  • Included an additional cleanup step in the test environment generation test to ensure proper teardown of the environment for robust testing.

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