Deprecation - Remove `Pds::TabNav` component

[didoo]

Description

As soon as https://github.com/hashicorp/cloud-ui/pull/6051 will be merged, there will not be any more instance of <Pds::TabNav> (or .pds-TabNav) in Cloud UI, so the component can be safely removed from Structure.

Changes

In this PR I have

• removed entirely the Pds::TabNav 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-1934

Testing

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

Relevant links

• https://github.com/hashicorp/cloud-ui/pull/6051
• DS-038: Structure maintenance RFC

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Name	Status	Preview	Comments	Updated (UTC)
structure	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 19, 2023 3:20pm

[didoo]

We seem to have some nav-related variables that we might be able to remove at this point too.

Nice catch! I missed them because they didn't contain tabnav as text.