Deprecation - Remove `Pds::ErrorState` / `Pds::Loading` / `Pds::Modal` / `Pds::Copyright + Pds::Logomark` components

[didoo]

Description

While working on https://github.com/hashicorp/structure/pull/117 and https://github.com/hashicorp/structure/pull/118 I realized there's an extra group of components that can be removed, because they're not used in Cloud UI:

• Pds::ErrorState
• Pds::Loading
• Pds::Modal

Also, I noticed that Pds::Copyright and Pds::Logomark could be moved inside the Pds::GlobalFooter component, since they're used only there.

Changes

In this PR I have

• removed entirely the Pds::ErrorState component (tests and documentation included)
• removed entirely the Pds::Loading component (tests and documentation included)
• removed entirely the Pds::Modal component (tests and documentation included)
• moved Pds::Copyright and Pds::Logomark components insidePds::GlobalFooter`
• added Storybook documentation files for the deprecated components
  • index
  • errorstate
  • loading
  • modal
  • copyright
  • logomark

Testing

I have symlinked my local directory package/pds-ember to the `` folder in Cloud UI, run the application and tested that everything worked as expected.

Relevant links

• DS-038: Structure maintenance RFC

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Name	Status	Preview	Updated
structure	✅ Ready (Inspect)	Visit Preview	Jul 28, 2022 at 6:29AM (UTC)

[didoo]

@jgwhite @meirish @cbfx @jesdavpet at the moment I have not received any comment, so… I’m going to interpret it as implicit approval :). Any objections?