chore(storybook): support static color settings in testing grid

[castastrophe]

Description

This update adds a resize observer to toggle the scale when the viewport drops below 480px (use scale = "large", else use scale = "medium").

This update also adds support for static colors in the testing grids saving us from having to run static white/static black snapshots separately. I accomplished this by updating which containers are returned by the fetchContainers function based on if the document is in a testing state or not.

Updated tests:

• ActionButton: Remove separate static black & static white tests; add both to the testing grid.
• ActionGroup: Add static black & static white to the test grid.
• Button: Remove separate static black & static white tests; add both to the testing grid.
• ClearButton: Remove OverBackground test; add static white to testing grid.
• CloseButton: Add static black & static white to testing grid.
• Divider: Remove static white and static black from separate snapshots; add to testing grid.
• Link: Remove static white and static black and static white + quiet and static black + quiet from separate snapshots; add to testing grid.
• ProgressBar: Remove static white from test; add to testing grid.
• Meter: Remove static white from test; add to testing grid (remove the skipBorders flag).
• ProgressCircle: Remove static white from test; add to testing grid.

How and where has this been tested?

Please tag yourself on the tests you've marked complete to confirm the tests have been run by someone other than the author.

Validation steps

• Expect to see tray snapshots leveraging the large scale by default in the small snapshots for VRT.
• On the action button story, expect to see a dark teal background with a grouping of white outlined buttons
• In the action button testing grid, expect to see a light teal and dark teal box containing the static white and static black variant tests:

• Review the changeset for this PR to validate other additions to the snapshots

Regression testing

Validate:

1. The documentation pages for at least two other components are still loading, including:

• The pages render correctly, are accessible, and are responsive.

2. If components have been modified, VRTs have been run on this branch:

• VRTs have been run and looked at.
• Any VRT changes have been accepted (by reviewer and/or PR author), or there are no changes.

Screenshots

To-do list

• I have read the contribution guidelines.
• I have updated relevant storybook stories and templates.
• I have tested these changes in Windows High Contrast mode.
• If my change impacts other components, I have tested to make sure they don't break.
• If my change impacts documentation, I have updated the documentation accordingly.
• ✨ This pull request is ready to merge. ✨

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Latest commit: f55a3b7

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