fix: missing aria-label on loading IconButton

[tjosepo]

Fixes #1207

Summary

aria-label was missing on the spinner when using a loading IconButton, which threw a console error.

What I did

I added an aria-label to the spinner.

How to test

• Is this testable with Jest or Chromatic screenshots?

Yes, I add a unit test to ensure the spinner has the aria-label attribute set.

• Does this need an update to the documentation?

No

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🦋 Changeset detected

Latest commit: bef25c872e92c793d1490d7269fac2d7d85a8e4b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

| Name | Type | | -------------------- | ----- | | @orbit-ui/components | Patch | | @sharegate/orbit-ui | Patch |

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