update documentation and format terraform resource examples

[aisvarya2]

• Updated the documentation of custom artifact webhook and custom docker webhook to include any_federeted references
• Updated the documentation of cleanup policy to record the behavior of the last_downloaded_before_in_days/last_downloaded_before_in_months attribute with artifacts that are never downloaded.
• Formatted terraform resources provided as an example

[github-actions]

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[aisvarya2]

I have read the CLA Document and I hereby sign the CLA

[soumyas-dev]

Hi @aisvarya2 ,

Thank you for your contribution.

Our CI pipeline issues have been resolved, and we are now accepting contributions again. If you are still interested in submitting this change, please rebase your branch on master and update the CHANGELOG. We look forward to reviewing your pull request.