Deprecation - Remove `Pds::Avatar` component

[didoo]

Description

As soon as https://github.com/hashicorp/cloud-ui/pull/6052 will be merged, there will not be any more instance of <Pds::Avatar> (or .pds-Avatar) in Cloud UI, so the component can be safely removed from Structure.

Changes

In this PR I have

• removed entirely the Pds::Avatar component (tests and documentation included)
  • didn't add a "deprecated" documentation page, because at this point they're useless (they're not included in the Cloud UI Storybook because is frozen in time)

Links

Jira ticket: https://hashicorp.atlassian.net/browse/HDS-510

Testing

Will do a full testing before releasing a new version of Structure.

Relevant links

• https://github.com/hashicorp/cloud-ui/pull/6052
• DS-038: Structure maintenance RFC

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Name	Status	Preview	Updated (UTC)
structure	✅ Ready (Inspect)	Visit Preview	May 19, 2023 10:14am