Replace Spinner from jetpack-components with wp-components Spinner

[simison]

Part of #48160

Remove the custom Spinner component from @automattic/jetpack-components and replace all usages with Spinner from @wordpress/components.

There's no Spinner in wp-ui yet so using the older one.

Proposed changes

Licensing screen (My Jetpack -> activate license)

Before

After

Related product discussion/links

Does this pull request change what data or activity we track or use?

Testing instructions

• Go to '..'

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Code Coverage Summary

This PR did not change code coverage!

That could be good or bad, depending on the situation. Everything covered before, and still is? Great! Nothing was covered before? Not so great. 🤷

Full summary · PHP report · JS report

[CGastrell]

Maybe close this one since #47451 already took care of most of the consumer-side work. Having the deprecation notice in place we can hold on the deletion. I can setup a schedule for Sep-Oct to finally delete the component and with #48487 also in the works this should happen organically. WDYT? Otherwise, let's just pick the commits that delete the component (rebase or new PR) and move forward.

[simison]

Sure 👍