Deprecation - Remove `Pds::Banner` and `Pds::Popup` components

[didoo]

Description

Now that the Pds::Banner and Pds::Popup components have been migrated in Cloud UI to Hds::Alert and Hds::Toast, we can remove these two components from the Structure codebase.

Changes

In this PR I have

• removed entirely the Pds::Banner component (tests and documentation included)
• removed entirely the Pds::Popup component (tests and documentation included)
• added Storybook documentation files for the deprecated components
  • index
  • banner
  • popup

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.

Notice: the current implementation may fail because an instance of <Pds::Banner> has been recently introduced by @noelledaley in this commit; I asked here to replace it with the corresponding <Hds::Alert> component so this deprecation can move forward.

Relevant links

• https://github.com/hashicorp/cloud-ui/pull/2913
• https://github.com/hashicorp/cloud-ui/pull/2951
• https://github.com/hashicorp/cloud-ui/pull/2898
• DS-038: Structure maintenance RFC

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Name	Status	Preview	Updated
structure	✅ Ready (Inspect)	Visit Preview	Jul 25, 2022 at 10:21AM (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?