Static progress followup (#5125)
* Fix HCM barloader style
* Fix High Contrast Mode for circle loader
* Update packages/@adobe/spectrum-css-temp/components/barloader/skin.css
* Fix edge case where variant is overbackground and static color is black
* barloader fix and reoder circloader vars
* Deprecate `variant` prop for overBackground
* story tweaks
* Add border color to isPending button mode for WHCM Forced Colors
* Update Accessibility docs for progress
* Update packages/@react-spectrum/progress/docs/ProgressBar.mdx
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Co-authored-by: Robert Snow <rsnow@adobe.com>
Co-authored-by: Daniel Lu <dl1644@gmail.com>
