Un-revert "Add loading prop for Button and IconButton (#3582)" (#4485)

* Revert "Revert "Add `loading` prop for `Button` and `IconButton` (#3582)" (#4…"

This reverts commit c01901f.

* only overrides btn label when loading

* update tooltip tests to accomodate loading message aria-describedby

* import missing modules in IconButton stories

* makes aria-labelledby prop remain set when when button is in a loading state

* Update packages/react/src/Button/Button.examples.stories.tsx

Co-authored-by: Kate Higa <[email protected]>

* Update packages/react/src/Button/Button.examples.stories.tsx

Co-authored-by: Kate Higa <[email protected]>

* updates textinput snapshots

* addresses remaining PR feedback

* appeases the linter, updates snaps

* leaves loading prop undefined so we do not always render the wrapper

* test(vrt): update snapshots

* trying again without changing colors on faux-disabled buttons

* replaces Status with AriaStatus

* replaces one more Status with AriaStatus

* rms added aria-disabled styles

* test(vrt): update snapshots

* Update icon button tests to make it work with the loading state

* add story with leading visual and count

* misc bugfixes:
- ensures counter stays rendered even when no children are passed
- preserves space between elements that are children of span[data-component=text]
- adds story and VRT for buttons with a trailing action but no leading/trailing visuals

* test(vrt): update snapshots

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Co-authored-by: Siddharth Kshetrapal <[email protected]>
Co-authored-by: Kate Higa <[email protected]>
Co-authored-by: mperrotti <[email protected]>
Co-authored-by: Armagan Ersoz <[email protected]>

Author: 4 people