Document Migration from upload_lambda_functions to PythonFunction Hook

[RepoBirdBot]

This PR updates the documentation to assist users in migrating from the deprecated runway.cfngin.hooks.aws_lambda.upload_lambda_functions hook to the new runway.cfngin.hooks.awslambda.PythonFunction hook. The changes include:

• A detailed explanation of the functional differences between the old and new hooks.
• Key configuration changes, including updated argument mappings such as:
  • args.bucket → args.bucket_name
  • args.prefix → args.object_prefix
  • args.functions.<func_name>.path → args.source_code
  • args.functions.<func_name>.runtime → args.runtime
• Guidance on handling Dockerization changes with clear instructions on enabling or disabling Docker builds.
• Before and after YAML examples to show how a single hook configuration may be split into multiple PythonFunction hook definitions.
• Updated lookup instructions for accessing hook-generated attributes in your blueprints/templates.

Since the deprecated hook is scheduled for removal in Runway v3.0.0, users should review these changes carefully and update their configurations accordingly. This documentation aims to provide clear, step-by-step guidance to ensure a smooth transition.

Please review and provide feedback if any further clarification or additional examples are needed.

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[ariel-frischer]

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This Pull Request was automatically generated by our agent, RepoBirdBot, to address issue #2850. This issue was marked as a good first issue and appeared to be unassigned.

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[ariel-frischer]

Darn, unfortunately this automation does not allow changes to branch names but I can always create a new branch + PR if needed to fix branch name pipeline issue. If these changes are no good that is fine you can always close this out.