Enhancement | Add comment to `config.tf` file when generating key

[juanmatias]

Describe the Enhance

When Leverage CLI finds an S3 Backend block with no Key definition in the config.tf file, it will generate a key and write it down to the file.

In this case add a comment previous to the key definition stating the key was generated automatically by the Leverage CLI.

Expected Behavior

• When the S3 key was generated by the Leverage CLI:
  • a comment is left there to note this situation.
  • the CLI output must explicit that this is happening

Use Case

n/a

Describe Ideal Solution

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Alternatives Considered

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Additional Context

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